78378972 has 48 divisors (see below), whose sum is σ = 209690880. Its totient is φ = 22321152.

The previous prime is 78378941. The next prime is 78378991. The reversal of 78378972 is 27987387.

It is a super-2 number, since 2×78378972² = 12286526503553568, which contains 22 as substring.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27804 + ... + 30492.

It is an arithmetic number, because the mean of its divisors is an integer number (4368560).

Almost surely, 2^78378972 is an apocalyptic number.

It is an amenable number.

78378972 is an abundant number, since it is smaller than the sum of its proper divisors (131311908).

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

78378972 is a wasteful number, since it uses less digits than its factorization.

78378972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3050 (or 3048 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 51.

The square root of 78378972 is about 8853.1899335776. The cubic root of 78378972 is about 427.9567240141.

The spelling of 78378972 in words is "seventy-eight million, three hundred seventy-eight thousand, nine hundred seventy-two".