97213540 has 24 divisors (see below), whose sum is σ = 208897920. Its totient is φ = 37980768.

The previous prime is 97213513. The next prime is 97213549. The reversal of 97213540 is 4531279.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (97213549) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55660 + ... + 57379.

It is an arithmetic number, because the mean of its divisors is an integer number (8704080).

Almost surely, 2^97213540 is an apocalyptic number.

It is an amenable number.

97213540 is an abundant number, since it is smaller than the sum of its proper divisors (111684380).

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

97213540 is a wasteful number, since it uses less digits than its factorization.

97213540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113091 (or 113089 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 97213540 is about 9859.6926929798. The cubic root of 97213540 is about 459.8070078887.

The spelling of 97213540 in words is "ninety-seven million, two hundred thirteen thousand, five hundred forty".