78266144 has 24 divisors (see below), whose sum is σ = 168095088. Its totient is φ = 35575360.

The previous prime is 78266143. The next prime is 78266159. The reversal of 78266144 is 44166287.

It is a super-2 number, since 2×78266144² = 12251178593257472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78266098 and 78266107.

It is not an unprimeable number, because it can be changed into a prime (78266143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110822 + ... + 111525.

It is an arithmetic number, because the mean of its divisors is an integer number (7003962).

Almost surely, 2^78266144 is an apocalyptic number.

It is an amenable number.

78266144 is an abundant number, since it is smaller than the sum of its proper divisors (89828944).

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

78266144 is a wasteful number, since it uses less digits than its factorization.

78266144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222368 (or 222360 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 78266144 is about 8846.8154722476. The cubic root of 78266144 is about 427.7512748234.

The spelling of 78266144 in words is "seventy-eight million, two hundred sixty-six thousand, one hundred forty-four".