75517207990 has 24 divisors (see below), whose sum is σ = 158123787552. Its totient is φ = 25891614000.

The previous prime is 75517207981. The next prime is 75517208003. The reversal of 75517207990 is 9970271557.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 77057886 + ... + 77058865.

It is an arithmetic number, because the mean of its divisors is an integer number (6588491148).

Almost surely, 2^75517207990 is an apocalyptic number.

75517207990 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

75517207990 is an abundant number, since it is smaller than the sum of its proper divisors (82606579562).

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

75517207990 is a wasteful number, since it uses less digits than its factorization.

75517207990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154116772 (or 154116765 counting only the distinct ones).

The product of its (nonzero) digits is 1389150, while the sum is 52.

The spelling of 75517207990 in words is "seventy-five billion, five hundred seventeen million, two hundred seven thousand, nine hundred ninety".