91559940 has 24 divisors (see below), whose sum is σ = 256368000. Its totient is φ = 24415968.

The previous prime is 91559939. The next prime is 91559947. The reversal of 91559940 is 4995519.

It is a happy number.

It is a super-2 number, since 2×91559940² = 16766445225607200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91559892 and 91559901.

It is not an unprimeable number, because it can be changed into a prime (91559947) 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, 762940 + ... + 763059.

It is an arithmetic number, because the mean of its divisors is an integer number (10682000).

Almost surely, 2^91559940 is an apocalyptic number.

It is an amenable number.

91559940 is an abundant number, since it is smaller than the sum of its proper divisors (164808060).

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

91559940 is a wasteful number, since it uses less digits than its factorization.

91559940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1526011 (or 1526009 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 91559940 is about 9568.6958359016. The cubic root of 91559940 is about 450.7148145498.

The spelling of 91559940 in words is "ninety-one million, five hundred fifty-nine thousand, nine hundred forty".