90626621 has 4 divisors (see below), whose sum is σ = 91718592. Its totient is φ = 89534652.

The previous prime is 90626617. The next prime is 90626623. The reversal of 90626621 is 12662609.

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: 12662609 = 223 ⋅56783.

It is a cyclic number.

It is not a de Polignac number, because 90626621 - 2² = 90626617 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 (90626623) 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, 545861 + ... + 546026.

It is an arithmetic number, because the mean of its divisors is an integer number (22929648).

Almost surely, 2^90626621 is an apocalyptic number.

It is an amenable number.

90626621 is a deficient number, since it is larger than the sum of its proper divisors (1091971).

90626621 is a wasteful number, since it uses less digits than its factorization.

90626621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091970.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 90626621 is about 9519.8015210402. The cubic root of 90626621 is about 449.1781228880.

The spelling of 90626621 in words is "ninety million, six hundred twenty-six thousand, six hundred twenty-one".