77972250 has 32 divisors (see below), whose sum is σ = 194620608. Its totient is φ = 20792400.

The previous prime is 77972233. The next prime is 77972261. The reversal of 77972250 is 5227977.

It is a junction number, because it is equal to n+sod(n) for n = 77972199 and 77972208.

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, 51232 + ... + 52731.

It is an arithmetic number, because the mean of its divisors is an integer number (6081894).

Almost surely, 2^77972250 is an apocalyptic number.

77972250 is an abundant number, since it is smaller than the sum of its proper divisors (116648358).

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

77972250 is a wasteful number, since it uses less digits than its factorization.

77972250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103983 (or 103973 counting only the distinct ones).

The product of its (nonzero) digits is 61740, while the sum is 39.

The square root of 77972250 is about 8830.1896921867. The cubic root of 77972250 is about 427.2151928100.

The spelling of 77972250 in words is "seventy-seven million, nine hundred seventy-two thousand, two hundred fifty".