77971960 has 32 divisors (see below), whose sum is σ = 191386800. Its totient is φ = 28353280.

The previous prime is 77971939. The next prime is 77972023. The reversal of 77971960 is 6917977.

It is a self number, because there is not a number n which added to its sum of digits gives 77971960.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88165 + ... + 89044.

Almost surely, 2^77971960 is an apocalyptic number.

It is an amenable number.

77971960 is an abundant number, since it is smaller than the sum of its proper divisors (113414840).

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

77971960 is a wasteful number, since it uses less digits than its factorization.

77971960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177231 (or 177227 counting only the distinct ones).

The product of its (nonzero) digits is 166698, while the sum is 46.

The square root of 77971960 is about 8830.1732712331. The cubic root of 77971960 is about 427.2146631662.

The spelling of 77971960 in words is "seventy-seven million, nine hundred seventy-one thousand, nine hundred sixty".