90459973646 has 36 divisors (see below), whose sum is σ = 160299823176. Its totient is φ = 37503492480.

The previous prime is 90459973609. The next prime is 90459973649. The reversal of 90459973646 is 64637995409.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90459973649) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 34884926 + ... + 34887518.

It is an arithmetic number, because the mean of its divisors is an integer number (4452772866).

Almost surely, 2^90459973646 is an apocalyptic number.

90459973646 is a deficient number, since it is larger than the sum of its proper divisors (69839849530).

90459973646 is an frugal number, since it uses more digits than its factorization.

90459973646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5257 (or 2633 counting only the distinct ones).

The product of its (nonzero) digits is 44089920, while the sum is 62.

The spelling of 90459973646 in words is "ninety billion, four hundred fifty-nine million, nine hundred seventy-three thousand, six hundred forty-six".