78455472 has 20 divisors (see below), whose sum is σ = 202676760. Its totient is φ = 26151808.

The previous prime is 78455471. The next prime is 78455477. The reversal of 78455472 is 27455487.

It is a super-2 number, since 2×78455472² = 12310522173485568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78455471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 817197 + ... + 817292.

It is an arithmetic number, because the mean of its divisors is an integer number (10133838).

Almost surely, 2^78455472 is an apocalyptic number.

It is an amenable number.

78455472 is an abundant number, since it is smaller than the sum of its proper divisors (124221288).

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

78455472 is a wasteful number, since it uses less digits than its factorization.

78455472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634500 (or 1634494 counting only the distinct ones).

The product of its digits is 313600, while the sum is 42.

The square root of 78455472 is about 8857.5093564726. The cubic root of 78455472 is about 428.0959111925.

The spelling of 78455472 in words is "seventy-eight million, four hundred fifty-five thousand, four hundred seventy-two".