78249132 has 48 divisors (see below), whose sum is σ = 218477280. Its totient is φ = 24076224.

The previous prime is 78249131. The next prime is 78249161. The reversal of 78249132 is 23194287.

It is a super-2 number, since 2×78249132² = 12245853317506848, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (78249131) 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, 26463 + ... + 29270.

It is an arithmetic number, because the mean of its divisors is an integer number (4551610).

Almost surely, 2^78249132 is an apocalyptic number.

It is an amenable number.

78249132 is an abundant number, since it is smaller than the sum of its proper divisors (140228148).

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

78249132 is a wasteful number, since it uses less digits than its factorization.

78249132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55759 (or 55751 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 78249132 is about 8845.8539440802. The cubic root of 78249132 is about 427.7202804427.

The spelling of 78249132 in words is "seventy-eight million, two hundred forty-nine thousand, one hundred thirty-two".