78776532 has 18 divisors (see below), whose sum is σ = 199129658. Its totient is φ = 26258832.

The previous prime is 78776519. The next prime is 78776561. The reversal of 78776532 is 23567787.

It can be written as a sum of positive squares in only one way, i.e., 77686596 + 1089936 = 8814^2 + 1044^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1094083 + ... + 1094154.

Almost surely, 2^78776532 is an apocalyptic number.

It is an amenable number.

78776532 is an abundant number, since it is smaller than the sum of its proper divisors (120353126).

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

78776532 is a wasteful number, since it uses less digits than its factorization.

78776532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2188247 (or 2188242 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 78776532 is about 8875.6144576024. The cubic root of 78776532 is about 428.6790760068.

The spelling of 78776532 in words is "seventy-eight million, seven hundred seventy-six thousand, five hundred thirty-two".