78172850 has 48 divisors (see below), whose sum is σ = 167400000. Its totient is φ = 26604480.

The previous prime is 78172847. The next prime is 78172921. The reversal of 78172850 is 5827187.

It is a super-2 number, since 2×78172850² = 12221988954245000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51401 + ... + 52899.

It is an arithmetic number, because the mean of its divisors is an integer number (3487500).

Almost surely, 2^78172850 is an apocalyptic number.

78172850 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78172850 is an abundant number, since it is smaller than the sum of its proper divisors (89227150).

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

78172850 is a wasteful number, since it uses less digits than its factorization.

78172850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1662 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 78172850 is about 8841.5411552512. The cubic root of 78172850 is about 427.5812460290.

The spelling of 78172850 in words is "seventy-eight million, one hundred seventy-two thousand, eight hundred fifty".