1626318440 has 64 divisors (see below), whose sum is σ = 3748204800. Its totient is φ = 634791168.

The previous prime is 1626318401. The next prime is 1626318443. The reversal of 1626318440 is 448136261.

It is a self number, because there is not a number n which added to its sum of digits gives 1626318440.

It is not an unprimeable number, because it can be changed into a prime (1626318443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 745271 + ... + 747449.

It is an arithmetic number, because the mean of its divisors is an integer number (58565700).

Almost surely, 2^1626318440 is an apocalyptic number.

1626318440 is a gapful number since it is divisible by the number (10) 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 1626318440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1874102400).

1626318440 is an abundant number, since it is smaller than the sum of its proper divisors (2121886360).

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

1626318440 is a wasteful number, since it uses less digits than its factorization.

1626318440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2634 (or 2630 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 1626318440 is about 40327.6386613449. The cubic root of 1626318440 is about 1175.9852162363.

The spelling of 1626318440 in words is "one billion, six hundred twenty-six million, three hundred eighteen thousand, four hundred forty".