91428715 has 8 divisors (see below), whose sum is σ = 125388000. Its totient is φ = 62693952.

The previous prime is 91428683. The next prime is 91428751. The reversal of 91428715 is 51782419.

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 91428715 - 2⁵ = 91428683 is a prime.

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, 1306090 + ... + 1306159.

It is an arithmetic number, because the mean of its divisors is an integer number (15673500).

Almost surely, 2^91428715 is an apocalyptic number.

91428715 is a deficient number, since it is larger than the sum of its proper divisors (33959285).

91428715 is a wasteful number, since it uses less digits than its factorization.

91428715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2612261.

The product of its digits is 20160, while the sum is 37.

The square root of 91428715 is about 9561.8363822019. The cubic root of 91428715 is about 450.4993879855.

The spelling of 91428715 in words is "ninety-one million, four hundred twenty-eight thousand, seven hundred fifteen".