1626664240 has 40 divisors (see below), whose sum is σ = 3904000128. Its totient is φ = 629675520.

The previous prime is 1626664223. The next prime is 1626664331. The reversal of 1626664240 is 424666261.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 1626664240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 325477 + ... + 330436.

Almost surely, 2^1626664240 is an apocalyptic number.

1626664240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1626664240 is an abundant number, since it is smaller than the sum of its proper divisors (2277335888).

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

1626664240 is a wasteful number, since it uses less digits than its factorization.

1626664240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655957 (or 655951 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 1626664240 is about 40331.9258156612. The cubic root of 1626664240 is about 1176.0685592560.

The spelling of 1626664240 in words is "one billion, six hundred twenty-six million, six hundred sixty-four thousand, two hundred forty".