91671944 has 48 divisors (see below), whose sum is σ = 215340300. Its totient is φ = 36263808.

The previous prime is 91671919. The next prime is 91671947. The reversal of 91671944 is 44917619.

It can be written as a sum of positive squares in 2 ways, for example, as 91431844 + 240100 = 9562^2 + 490^2 .

It is not an unprimeable number, because it can be changed into a prime (91671947) 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, 3899 + ... + 14090.

Almost surely, 2^91671944 is an apocalyptic number.

It is an amenable number.

91671944 is an abundant number, since it is smaller than the sum of its proper divisors (123668356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91671944 is a wasteful number, since it uses less digits than its factorization.

91671944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18022 (or 18011 counting only the distinct ones).

The product of its digits is 54432, while the sum is 41.

The square root of 91671944 is about 9574.5466733418. The cubic root of 91671944 is about 450.8985240464.

It can be divided in two parts, 9167 and 1944, that added together give a palindrome (11111).

The spelling of 91671944 in words is "ninety-one million, six hundred seventy-one thousand, nine hundred forty-four".