91928137 has 8 divisors (see below), whose sum is σ = 110590400. Its totient is φ = 74648304.

The previous prime is 91928107. The next prime is 91928141. The reversal of 91928137 is 73182919.

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 91928137 - 2⁷ = 91928009 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91928137.

It is not an unprimeable number, because it can be changed into a prime (91928107) 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, 345462 + ... + 345727.

It is an arithmetic number, because the mean of its divisors is an integer number (13823800).

Almost surely, 2^91928137 is an apocalyptic number.

It is an amenable number.

91928137 is a deficient number, since it is larger than the sum of its proper divisors (18662263).

91928137 is a wasteful number, since it uses less digits than its factorization.

91928137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691215.

The product of its digits is 27216, while the sum is 40.

The square root of 91928137 is about 9587.9161969638. The cubic root of 91928137 is about 451.3181711655.

The spelling of 91928137 in words is "ninety-one million, nine hundred twenty-eight thousand, one hundred thirty-seven".