78144372 has 24 divisors (see below), whose sum is σ = 202596800. Its totient is φ = 26048088.

The previous prime is 78144361. The next prime is 78144413. The reversal of 78144372 is 27344187.

It is a happy number.

It is a super-2 number, since 2×78144372² = 12213085750548768, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361672 + ... + 361887.

Almost surely, 2^78144372 is an apocalyptic number.

It is an amenable number.

78144372 is an abundant number, since it is smaller than the sum of its proper divisors (124452428).

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

78144372 is a wasteful number, since it uses less digits than its factorization.

78144372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723572 (or 723564 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 78144372 is about 8839.9305427136. The cubic root of 78144372 is about 427.5293177801.

The spelling of 78144372 in words is "seventy-eight million, one hundred forty-four thousand, three hundred seventy-two".