90450621 has 16 divisors (see below), whose sum is σ = 141054400. Its totient is φ = 57126384.

The previous prime is 90450593. The next prime is 90450641. The reversal of 90450621 is 12605409.

It is not a de Polignac number, because 90450621 - 2⁵ = 90450589 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90450641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87646 + ... + 88671.

It is an arithmetic number, because the mean of its divisors is an integer number (8815900).

Almost surely, 2^90450621 is an apocalyptic number.

It is an amenable number.

90450621 is a deficient number, since it is larger than the sum of its proper divisors (50603779).

90450621 is a wasteful number, since it uses less digits than its factorization.

90450621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176345 (or 176339 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 90450621 is about 9510.5531384878. The cubic root of 90450621 is about 448.8871613578.

The spelling of 90450621 in words is "ninety million, four hundred fifty thousand, six hundred twenty-one".