3172421640 has 64 divisors (see below), whose sum is σ = 10018180800. Its totient is φ = 801453312.

The previous prime is 3172421639. The next prime is 3172421653. The reversal of 3172421640 is 461242713.

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 = 3172421598 and 3172421607.

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, 693427 + ... + 697986.

It is an arithmetic number, because the mean of its divisors is an integer number (156534075).

Almost surely, 2^3172421640 is an apocalyptic number.

3172421640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3172421640 is an abundant number, since it is smaller than the sum of its proper divisors (6845759160).

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

3172421640 is a wasteful number, since it uses less digits than its factorization.

3172421640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391446 (or 1391442 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 3172421640 is about 56324.2544557849. The cubic root of 3172421640 is about 1469.3670652011.

The spelling of 3172421640 in words is "three billion, one hundred seventy-two million, four hundred twenty-one thousand, six hundred forty".