90421530885 has 36 divisors (see below), whose sum is σ = 182319336108. Its totient is φ = 41335555968.

The previous prime is 90421530863. The next prime is 90421530973. The reversal of 90421530885 is 58803512409.

90421530885 is a `hidden beast` number, since 90 + 4 + 21 + 530 + 8 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14845472964 + 75576057921 = 121842^2 + 274911^2 .

It is not a de Polignac number, because 90421530885 - 2⁵ = 90421530853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 90421530885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20501544 + ... + 20505953.

It is an arithmetic number, because the mean of its divisors is an integer number (5064426003).

Almost surely, 2^90421530885 is an apocalyptic number.

It is an amenable number.

90421530885 is an abundant number, since it is smaller than the sum of its proper divisors (91897805223).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90421530885 is a wasteful number, since it uses less digits than its factorization.

90421530885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41007522 (or 41007512 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 90421530885 in words is "ninety billion, four hundred twenty-one million, five hundred thirty thousand, eight hundred eighty-five".