78424880 has 40 divisors (see below), whose sum is σ = 184660800. Its totient is φ = 30970368.

The previous prime is 78424877. The next prime is 78424883. The reversal of 78424880 is 8842487.

It is an interprime number because it is at equal distance from previous prime (78424877) and next prime (78424883).

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (78424883) 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, 116 + ... + 12524.

It is an arithmetic number, because the mean of its divisors is an integer number (4616520).

Almost surely, 2^78424880 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 78424880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92330400).

78424880 is an abundant number, since it is smaller than the sum of its proper divisors (106235920).

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

78424880 is a wasteful number, since it uses less digits than its factorization.

78424880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12501 (or 12495 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The square root of 78424880 is about 8855.7822918136. The cubic root of 78424880 is about 428.0402617379.

The spelling of 78424880 in words is "seventy-eight million, four hundred twenty-four thousand, eight hundred eighty".