78292816 has 40 divisors (see below), whose sum is σ = 174236864. Its totient is φ = 33384960.

The previous prime is 78292807. The next prime is 78292859. The reversal of 78292816 is 61829287.

It is a super-2 number, since 2×78292816² = 12259530074419712, which contains 22 as substring.

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, 21976 + ... + 25288.

Almost surely, 2^78292816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78292816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87118432).

78292816 is an abundant number, since it is smaller than the sum of its proper divisors (95944048).

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

78292816 is a wasteful number, since it uses less digits than its factorization.

78292816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539 (or 3533 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 78292816 is about 8848.3227789226. The cubic root of 78292816 is about 427.7998598422.

It can be divided in two parts, 7829281 and 6, that added together give a palindrome (7829287).

The spelling of 78292816 in words is "seventy-eight million, two hundred ninety-two thousand, eight hundred sixteen".