78718580 has 24 divisors (see below), whose sum is σ = 165719400. Its totient is φ = 31409280.

The previous prime is 78718543. The next prime is 78718597. The reversal of 78718580 is 8581787.

It can be written as a sum of positive squares in 4 ways, for example, as 2226064 + 76492516 = 1492^2 + 8746^2 .

It is a super-2 number, since 2×78718580² = 12393229674432800, 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, 3746 + ... + 13094.

It is an arithmetic number, because the mean of its divisors is an integer number (6904975).

Almost surely, 2^78718580 is an apocalyptic number.

It is an amenable number.

78718580 is an abundant number, since it is smaller than the sum of its proper divisors (87000820).

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

78718580 is a wasteful number, since it uses less digits than its factorization.

78718580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9779 (or 9777 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 44.

The square root of 78718580 is about 8872.3491815866. The cubic root of 78718580 is about 428.5739308849.

The spelling of 78718580 in words is "seventy-eight million, seven hundred eighteen thousand, five hundred eighty".