91207680 has 96 divisors (see below), whose sum is σ = 291891600. Its totient is φ = 24313856.

The previous prime is 91207643. The next prime is 91207693. The reversal of 91207680 is 8670219.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

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, 29236 + ... + 32204.

Almost surely, 2^91207680 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91207680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (145945800).

91207680 is an abundant number, since it is smaller than the sum of its proper divisors (200683920).

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

91207680 is a wasteful number, since it uses less digits than its factorization.

91207680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2999 (or 2979 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 91207680 is about 9550.2712003377. The cubic root of 91207680 is about 450.1360576242.

Adding to 91207680 its reverse (8670219), we get a palindrome (99877899).

The spelling of 91207680 in words is "ninety-one million, two hundred seven thousand, six hundred eighty".