196557640 has 32 divisors (see below), whose sum is σ = 445642560. Its totient is φ = 78020800.

The previous prime is 196557631. The next prime is 196557659. The reversal of 196557640 is 46755691.

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, 13516 + ... + 23995.

It is an arithmetic number, because the mean of its divisors is an integer number (13926330).

Almost surely, 2^196557640 is an apocalyptic number.

196557640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

196557640 is an abundant number, since it is smaller than the sum of its proper divisors (249084920).

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

196557640 is a wasteful number, since it uses less digits than its factorization.

196557640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37653 (or 37649 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The square root of 196557640 is about 14019.9015688413. The cubic root of 196557640 is about 581.4289380095.

The spelling of 196557640 in words is "one hundred ninety-six million, five hundred fifty-seven thousand, six hundred forty".