90708621 has 4 divisors (see below), whose sum is σ = 120944832. Its totient is φ = 60472412.

The previous prime is 90708613. The next prime is 90708671. The reversal of 90708621 is 12680709.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12680709 = 3 ⋅4226903.

It is a cyclic number.

It is not a de Polignac number, because 90708621 - 2³ = 90708613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90708671) 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, 15118101 + ... + 15118106.

It is an arithmetic number, because the mean of its divisors is an integer number (30236208).

Almost surely, 2^90708621 is an apocalyptic number.

It is an amenable number.

90708621 is a deficient number, since it is larger than the sum of its proper divisors (30236211).

90708621 is a wasteful number, since it uses less digits than its factorization.

90708621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30236210.

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

The square root of 90708621 is about 9524.1073597477. The cubic root of 90708621 is about 449.3135558782.

The spelling of 90708621 in words is "ninety million, seven hundred eight thousand, six hundred twenty-one".