1626122640 has 80 divisors (see below), whose sum is σ = 5057319168. Its totient is φ = 432227328.

The previous prime is 1626122623. The next prime is 1626122711. The reversal of 1626122640 is 462216261.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 1626122598 and 1626122607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64297 + ... + 85943.

Almost surely, 2^1626122640 is an apocalyptic number.

1626122640 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 1626122640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2528659584).

1626122640 is an abundant number, since it is smaller than the sum of its proper divisors (3431196528).

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

1626122640 is a wasteful number, since it uses less digits than its factorization.

1626122640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21976 (or 21970 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 1626122640 is about 40325.2109727897. The cubic root of 1626122640 is about 1175.9380202422.

The spelling of 1626122640 in words is "one billion, six hundred twenty-six million, one hundred twenty-two thousand, six hundred forty".