102161640 has 64 divisors (see below), whose sum is σ = 350271360. Its totient is φ = 23351040.

The previous prime is 102161623. The next prime is 102161659. The reversal of 102161640 is 46161201.

It is a Harshad number since it is a multiple of its sum of digits (21).

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, 59971 + ... + 61650.

It is an arithmetic number, because the mean of its divisors is an integer number (5472990).

Almost surely, 2^102161640 is an apocalyptic number.

102161640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

102161640 is an abundant number, since it is smaller than the sum of its proper divisors (248109720).

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

102161640 is a wasteful number, since it uses less digits than its factorization.

102161640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121642 (or 121638 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 102161640 is about 10107.5041429623. The cubic root of 102161640 is about 467.4795514710.

The spelling of 102161640 in words is "one hundred two million, one hundred sixty-one thousand, six hundred forty".