90240621 has 16 divisors (see below), whose sum is σ = 121661568. Its totient is φ = 59494400.

The previous prime is 90240599. The next prime is 90240637. The reversal of 90240621 is 12604209.

It is a cyclic number.

It is not a de Polignac number, because 90240621 - 2⁵ = 90240589 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90240591 and 90240600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90247621) 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, 140461 + ... + 141101.

It is an arithmetic number, because the mean of its divisors is an integer number (7603848).

Almost surely, 2^90240621 is an apocalyptic number.

It is an amenable number.

90240621 is a deficient number, since it is larger than the sum of its proper divisors (31420947).

90240621 is a wasteful number, since it uses less digits than its factorization.

90240621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1092.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 90240621 is about 9499.5063555955. The cubic root of 90240621 is about 448.5394970740.

The spelling of 90240621 in words is "ninety million, two hundred forty thousand, six hundred twenty-one".