78611472 has 60 divisors (see below), whose sum is σ = 228162480. Its totient is φ = 26202528.

The previous prime is 78611461. The next prime is 78611479. The reversal of 78611472 is 27411687.

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 (78611479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6222 + ... + 13997.

It is an arithmetic number, because the mean of its divisors is an integer number (3802708).

Almost surely, 2^78611472 is an apocalyptic number.

78611472 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78611472 is an abundant number, since it is smaller than the sum of its proper divisors (149551008).

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

78611472 is a wasteful number, since it uses less digits than its factorization.

78611472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20242 (or 20224 counting only the distinct ones).

The product of its digits is 18816, while the sum is 36.

The square root of 78611472 is about 8866.3110705637. The cubic root of 78611472 is about 428.3794637426.

The spelling of 78611472 in words is "seventy-eight million, six hundred eleven thousand, four hundred seventy-two".