78508901540 has 24 divisors (see below), whose sum is σ = 166855066560. Its totient is φ = 31025203808.

The previous prime is 78508901503. The next prime is 78508901551. The reversal of 78508901540 is 4510980587.

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, 23645600 + ... + 23648919.

It is an arithmetic number, because the mean of its divisors is an integer number (6952294440).

Almost surely, 2^78508901540 is an apocalyptic number.

It is an amenable number.

78508901540 is an abundant number, since it is smaller than the sum of its proper divisors (88346165020).

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

78508901540 is a wasteful number, since it uses less digits than its factorization.

78508901540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47294611 (or 47294609 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 47.

The spelling of 78508901540 in words is "seventy-eight billion, five hundred eight million, nine hundred one thousand, five hundred forty".