90101320440 has 64 divisors (see below), whose sum is σ = 284530492800. Its totient is φ = 22762438272.

The previous prime is 90101320433. The next prime is 90101320453. The reversal of 90101320440 is 4402310109.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 90101320440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19756782 + ... + 19761341.

It is an arithmetic number, because the mean of its divisors is an integer number (4445788950).

Almost surely, 2^90101320440 is an apocalyptic number.

It is an amenable number.

90101320440 is an abundant number, since it is smaller than the sum of its proper divisors (194429172360).

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

90101320440 is a wasteful number, since it uses less digits than its factorization.

90101320440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39518156 (or 39518152 counting only the distinct ones).

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

Adding to 90101320440 its reverse (4402310109), we get a palindrome (94503630549).

The spelling of 90101320440 in words is "ninety billion, one hundred one million, three hundred twenty thousand, four hundred forty".