75680991 has 12 divisors (see below), whose sum is σ = 115747632. Its totient is φ = 47486016.

The previous prime is 75680953. The next prime is 75681007. The reversal of 75680991 is 19908657.

It is not a de Polignac number, because 75680991 - 2⁷ = 75680863 is a prime.

It is a super-2 number, since 2×75680991² = 11455224797484162, which contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75680921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 247171 + ... + 247476.

It is an arithmetic number, because the mean of its divisors is an integer number (9645636).

Almost surely, 2^75680991 is an apocalyptic number.

75680991 is a deficient number, since it is larger than the sum of its proper divisors (40066641).

75680991 is a wasteful number, since it uses less digits than its factorization.

75680991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494670 (or 494667 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 45.

The square root of 75680991 is about 8699.4822259718. The cubic root of 75680991 is about 422.9888667995.

It can be divided in two parts, 756809 and 91, that added together give a square (756900 = 870²).

The spelling of 75680991 in words is "seventy-five million, six hundred eighty thousand, nine hundred ninety-one".