91928087 has 8 divisors (see below), whose sum is σ = 94179456. Its totient is φ = 89702712.

The previous prime is 91928069. The next prime is 91928101. The reversal of 91928087 is 78082919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91928087 - 2⁸ = 91927831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91978087) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 758 + ... + 13580.

It is an arithmetic number, because the mean of its divisors is an integer number (11772432).

Almost surely, 2^91928087 is an apocalyptic number.

91928087 is a deficient number, since it is larger than the sum of its proper divisors (2251369).

91928087 is a wasteful number, since it uses less digits than its factorization.

91928087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12997.

The product of its (nonzero) digits is 72576, while the sum is 44.

The square root of 91928087 is about 9587.9135895147. The cubic root of 91928087 is about 451.3180893410.

The spelling of 91928087 in words is "ninety-one million, nine hundred twenty-eight thousand, eighty-seven".