78128580 has 48 divisors (see below), whose sum is σ = 219409344. Its totient is φ = 20772480.

The previous prime is 78128579. The next prime is 78128591. The reversal of 78128580 is 8582187.

It is a super-2 number, since 2×78128580² = 12208150025632800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20635 + ... + 24125.

It is an arithmetic number, because the mean of its divisors is an integer number (4571028).

Almost surely, 2^78128580 is an apocalyptic number.

It is an amenable number.

78128580 is an abundant number, since it is smaller than the sum of its proper divisors (141280764).

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

78128580 is a wasteful number, since it uses less digits than its factorization.

78128580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3876 (or 3874 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 78128580 is about 8839.0372778940. The cubic root of 78128580 is about 427.5005163976.

The spelling of 78128580 in words is "seventy-eight million, one hundred twenty-eight thousand, five hundred eighty".