77571952 has 20 divisors (see below), whose sum is σ = 159137136. Its totient is φ = 36504320.

The previous prime is 77571947. The next prime is 77571953. The reversal of 77571952 is 25917577.

It is a junction number, because it is equal to n+sod(n) for n = 77571899 and 77571908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77571953) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142324 + ... + 142867.

Almost surely, 2^77571952 is an apocalyptic number.

It is an amenable number.

77571952 is an abundant number, since it is smaller than the sum of its proper divisors (81565184).

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

77571952 is a wasteful number, since it uses less digits than its factorization.

77571952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285216 (or 285210 counting only the distinct ones).

The product of its digits is 154350, while the sum is 43.

The square root of 77571952 is about 8807.4940817465. The cubic root of 77571952 is about 426.4828515934.

It can be divided in two parts, 775 and 71952, that added together give a palindrome (72727).

The spelling of 77571952 in words is "seventy-seven million, five hundred seventy-one thousand, nine hundred fifty-two".