91712080 has 40 divisors (see below), whose sum is σ = 218439144. Its totient is φ = 35788800.

The previous prime is 91712051. The next prime is 91712081. The reversal of 91712080 is 8021719.

It can be written as a sum of positive squares in 4 ways, for example, as 929296 + 90782784 = 964^2 + 9528^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×91712080² = 16822211235852800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91712081) 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, 10701 + ... + 17260.

Almost surely, 2^91712080 is an apocalyptic number.

It is an amenable number.

91712080 is an abundant number, since it is smaller than the sum of its proper divisors (126727064).

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

91712080 is a wasteful number, since it uses less digits than its factorization.

91712080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28015 (or 28009 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 91712080 is about 9576.6424178832. The cubic root of 91712080 is about 450.9643188865.

Adding to 91712080 its reverse (8021719), we get a palindrome (99733799).

The spelling of 91712080 in words is "ninety-one million, seven hundred twelve thousand, eighty".