2646394740 has 240 divisors, whose sum is σ = 9155893824. Its totient is φ = 634521600.

The previous prime is 2646394711. The next prime is 2646394747. The reversal of 2646394740 is 474936462.

It is a happy number.

2646394740 is a `hidden beast` number, since 2 + 6 + 4 + 639 + 4 + 7 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2646394747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1727775 + ... + 1729305.

Almost surely, 2^2646394740 is an apocalyptic number.

2646394740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2646394740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4577946912).

2646394740 is an abundant number, since it is smaller than the sum of its proper divisors (6509499084).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2646394740 is a wasteful number, since it uses less digits than its factorization.

2646394740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1660 (or 1649 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 45.

The square root of 2646394740 is about 51443.1214060733. The cubic root of 2646394740 is about 1383.1996643798.

It can be divided in two parts, 2646 and 394740, that added together give a triangular number (397386 = T₈₉₁).

The spelling of 2646394740 in words is "two billion, six hundred forty-six million, three hundred ninety-four thousand, seven hundred forty".