78781532 has 48 divisors (see below), whose sum is σ = 148925952. Its totient is φ = 36379200.

The previous prime is 78781531. The next prime is 78781537. The reversal of 78781532 is 23518787.

Its product of digits (94080) is a multiple of the sum of its prime divisors (336).

It is a self number, because there is not a number n which added to its sum of digits gives 78781532.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 521657 + ... + 521807.

It is an arithmetic number, because the mean of its divisors is an integer number (3102624).

Almost surely, 2^78781532 is an apocalyptic number.

It is an amenable number.

78781532 is a deficient number, since it is larger than the sum of its proper divisors (70144420).

78781532 is a wasteful number, since it uses less digits than its factorization.

78781532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338 (or 336 counting only the distinct ones).

The product of its digits is 94080, while the sum is 41.

The square root of 78781532 is about 8875.8961237725. The cubic root of 78781532 is about 428.6881453323.

The spelling of 78781532 in words is "seventy-eight million, seven hundred eighty-one thousand, five hundred thirty-two".