91772642 has 16 divisors (see below), whose sum is σ = 148894200. Its totient is φ = 42172032.

The previous prime is 91772567. The next prime is 91772657. The reversal of 91772642 is 24627719.

It can be written as a sum of positive squares in 4 ways, for example, as 58813561 + 32959081 = 7669^2 + 5741^2 .

It is a junction number, because it is equal to n+sod(n) for n = 91772596 and 91772605.

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, 1517 + ... + 13632.

Almost surely, 2^91772642 is an apocalyptic number.

91772642 is a deficient number, since it is larger than the sum of its proper divisors (57121558).

91772642 is a wasteful number, since it uses less digits than its factorization.

91772642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15397.

The product of its digits is 42336, while the sum is 38.

The square root of 91772642 is about 9579.8038602051. The cubic root of 91772642 is about 451.0635616893.

The spelling of 91772642 in words is "ninety-one million, seven hundred seventy-two thousand, six hundred forty-two".