321640488400 has 180 divisors, whose sum is σ = 980622236160. Its totient is φ = 100251513600.

The previous prime is 321640488371. The next prime is 321640488419. The reversal of 321640488400 is 4884046123.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 530320 + ... + 961519.

It is an arithmetic number, because the mean of its divisors is an integer number (5447901312).

Almost surely, 2^321640488400 is an apocalyptic number.

It is an amenable number.

321640488400 is an abundant number, since it is smaller than the sum of its proper divisors (658981747760).

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

321640488400 is a wasteful number, since it uses less digits than its factorization.

321640488400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491882 (or 1491864 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 321640488400 in words is "three hundred twenty-one billion, six hundred forty million, four hundred eighty-eight thousand, four hundred".