90634891 has 4 divisors (see below), whose sum is σ = 90660384. Its totient is φ = 90609400.

The previous prime is 90634879. The next prime is 90634909. The reversal of 90634891 is 19843609.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90634891 - 2¹³ = 90626699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90634861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6340 + ... + 14881.

It is an arithmetic number, because the mean of its divisors is an integer number (22665096).

Almost surely, 2^90634891 is an apocalyptic number.

90634891 is a deficient number, since it is larger than the sum of its proper divisors (25493).

90634891 is a wasteful number, since it uses less digits than its factorization.

90634891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25492.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 90634891 is about 9520.2358689268. The cubic root of 90634891 is about 449.1917855037.

The spelling of 90634891 in words is "ninety million, six hundred thirty-four thousand, eight hundred ninety-one".