91635642 has 24 divisors (see below), whose sum is σ = 226907616. Its totient is φ = 26181576.

The previous prime is 91635641. The next prime is 91635647. The reversal of 91635642 is 24653619.

It is a happy number.

91635642 is a `hidden beast` number, since 9 + 1 + 6 + 3 + 5 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 91635597 and 91635606.

It is not an unprimeable number, because it can be changed into a prime (91635641) 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, 363508 + ... + 363759.

It is an arithmetic number, because the mean of its divisors is an integer number (9454484).

Almost surely, 2^91635642 is an apocalyptic number.

91635642 is an abundant number, since it is smaller than the sum of its proper divisors (135271974).

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

91635642 is a wasteful number, since it uses less digits than its factorization.

91635642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727282 (or 727279 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 91635642 is about 9572.6507300747. The cubic root of 91635642 is about 450.8389977304.

The spelling of 91635642 in words is "ninety-one million, six hundred thirty-five thousand, six hundred forty-two".