77971932 has 36 divisors (see below), whose sum is σ = 205667280. Its totient is φ = 24860352.

The previous prime is 77971931. The next prime is 77971939. The reversal of 77971932 is 23917977.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77971931) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 46257 + ... + 47912.

It is an arithmetic number, because the mean of its divisors is an integer number (5712980).

Almost surely, 2^77971932 is an apocalyptic number.

It is an amenable number.

77971932 is an abundant number, since it is smaller than the sum of its proper divisors (127695348).

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

77971932 is a wasteful number, since it uses less digits than its factorization.

77971932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94202 (or 94197 counting only the distinct ones).

The product of its digits is 166698, while the sum is 45.

The square root of 77971932 is about 8830.1716857601. The cubic root of 77971932 is about 427.2146120281.

The spelling of 77971932 in words is "seventy-seven million, nine hundred seventy-one thousand, nine hundred thirty-two".