163231640 has 64 divisors (see below), whose sum is σ = 431494560. Its totient is φ = 54789120.

The previous prime is 163231609. The next prime is 163231661. The reversal of 163231640 is 46132361.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8549 + ... + 19988.

Almost surely, 2^163231640 is an apocalyptic number.

163231640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163231640 is an abundant number, since it is smaller than the sum of its proper divisors (268262920).

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

163231640 is a wasteful number, since it uses less digits than its factorization.

163231640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28572 (or 28568 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 163231640 is about 12776.2138366576. The cubic root of 163231640 is about 546.5141966882.

The spelling of 163231640 in words is "one hundred sixty-three million, two hundred thirty-one thousand, six hundred forty".