78155132 has 24 divisors (see below), whose sum is σ = 157059840. Its totient is φ = 33654960.

The previous prime is 78155111. The next prime is 78155141. The reversal of 78155132 is 23155187.

It is a super-2 number, since 2×78155132² = 12216449315874848, which contains 22 as substring.

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, 45908 + ... + 47579.

It is an arithmetic number, because the mean of its divisors is an integer number (6544160).

Almost surely, 2^78155132 is an apocalyptic number.

It is an amenable number.

78155132 is an abundant number, since it is smaller than the sum of its proper divisors (78904708).

78155132 is a wasteful number, since it uses less digits than its factorization.

78155132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93521 (or 93519 counting only the distinct ones).

The product of its digits is 8400, while the sum is 32.

The square root of 78155132 is about 8840.5391238318. The cubic root of 78155132 is about 427.5489395998.

Subtracting from 78155132 its reverse (23155187), we obtain a palindrome (54999945).

It can be divided in two parts, 78155 and 132, that added together give a palindrome (78287).

The spelling of 78155132 in words is "seventy-eight million, one hundred fifty-five thousand, one hundred thirty-two".