78478972 has 24 divisors (see below), whose sum is σ = 161349552. Its totient is φ = 32928000.

The previous prime is 78478969. The next prime is 78478973. The reversal of 78478972 is 27987487.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78478973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68029 + ... + 69172.

It is an arithmetic number, because the mean of its divisors is an integer number (6722898).

Almost surely, 2^78478972 is an apocalyptic number.

It is an amenable number.

78478972 is an abundant number, since it is smaller than the sum of its proper divisors (82870580).

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

78478972 is a wasteful number, since it uses less digits than its factorization.

78478972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137229 (or 137227 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The square root of 78478972 is about 8858.8358151622. The cubic root of 78478972 is about 428.1386498712.

The spelling of 78478972 in words is "seventy-eight million, four hundred seventy-eight thousand, nine hundred seventy-two".