90427621 has 4 divisors (see below), whose sum is σ = 90613792. Its totient is φ = 90241452.

The previous prime is 90427549. The next prime is 90427633. The reversal of 90427621 is 12672409.

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.

It is a cyclic number.

It is not a de Polignac number, because 90427621 - 2⁹ = 90427109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90427721) 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, 92355 + ... + 93328.

It is an arithmetic number, because the mean of its divisors is an integer number (22653448).

Almost surely, 2^90427621 is an apocalyptic number.

It is an amenable number.

90427621 is a deficient number, since it is larger than the sum of its proper divisors (186171).

90427621 is a wasteful number, since it uses less digits than its factorization.

90427621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186170.

The product of its (nonzero) digits is 6048, while the sum is 31.

The square root of 90427621 is about 9509.3438785229. The cubic root of 90427621 is about 448.8491100991.

The spelling of 90427621 in words is "ninety million, four hundred twenty-seven thousand, six hundred twenty-one".