91786401 has 12 divisors (see below), whose sum is σ = 151520512. Its totient is φ = 52449336.

The previous prime is 91786369. The next prime is 91786403. The reversal of 91786401 is 10468719.

91786401 is a `hidden beast` number, since 9 + 1 + 7 + 8 + 640 + 1 = 666.

It is not a de Polignac number, because 91786401 - 2⁵ = 91786369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91786403) 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, 728401 + ... + 728526.

Almost surely, 2^91786401 is an apocalyptic number.

It is an amenable number.

91786401 is a deficient number, since it is larger than the sum of its proper divisors (59734111).

91786401 is a wasteful number, since it uses less digits than its factorization.

91786401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1456940 (or 1456937 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 91786401 is about 9580.5219586409. The cubic root of 91786401 is about 451.0861024425.

The spelling of 91786401 in words is "ninety-one million, seven hundred eighty-six thousand, four hundred one".