90691860 has 96 divisors (see below), whose sum is σ = 292061952. Its totient is φ = 20597760.

The previous prime is 90691831. The next prime is 90691873. The reversal of 90691860 is 6819609.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75424 + ... + 76616.

It is an arithmetic number, because the mean of its divisors is an integer number (3042312).

Almost surely, 2^90691860 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 90691860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146030976).

90691860 is an abundant number, since it is smaller than the sum of its proper divisors (201370092).

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

90691860 is a wasteful number, since it uses less digits than its factorization.

90691860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1393 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 39.

The square root of 90691860 is about 9523.2273941138. The cubic root of 90691860 is about 449.2858796833.

The spelling of 90691860 in words is "ninety million, six hundred ninety-one thousand, eight hundred sixty".