78264220 has 24 divisors (see below), whose sum is σ = 167051808. Its totient is φ = 30792000.

The previous prime is 78264217. The next prime is 78264227. The reversal of 78264220 is 2246287.

It is a super-2 number, since 2×78264220² = 12250576264416800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78264227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30856 + ... + 33295.

It is an arithmetic number, because the mean of its divisors is an integer number (6960492).

Almost surely, 2^78264220 is an apocalyptic number.

It is an amenable number.

78264220 is an abundant number, since it is smaller than the sum of its proper divisors (88787588).

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

78264220 is a wasteful number, since it uses less digits than its factorization.

78264220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64221 (or 64219 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 78264220 is about 8846.7067318862. The cubic root of 78264220 is about 427.7477696884.

The spelling of 78264220 in words is "seventy-eight million, two hundred sixty-four thousand, two hundred twenty".