321072540 has 48 divisors (see below), whose sum is σ = 951888672. Its totient is φ = 80582656.

The previous prime is 321072539. The next prime is 321072541. The reversal of 321072540 is 45270123.

It is an interprime number because it is at equal distance from previous prime (321072539) and next prime (321072541).

It is a self number, because there is not a number n which added to its sum of digits gives 321072540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321072541) 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, 156369 + ... + 158408.

It is an arithmetic number, because the mean of its divisors is an integer number (19831014).

Almost surely, 2^321072540 is an apocalyptic number.

321072540 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

321072540 is an abundant number, since it is smaller than the sum of its proper divisors (630816132).

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

321072540 is a wasteful number, since it uses less digits than its factorization.

321072540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314806 (or 314804 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 321072540 is about 17918.4971468034. The cubic root of 321072540 is about 684.7537005002.

The spelling of 321072540 in words is "three hundred twenty-one million, seventy-two thousand, five hundred forty".