90651931488 has 168 divisors, whose sum is σ = 276813180000. Its totient is φ = 29175116544.

The previous prime is 90651931471. The next prime is 90651931493. The reversal of 90651931488 is 88413915609.

90651931488 is a `hidden beast` number, since 90 + 6 + 519 + 31 + 4 + 8 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 609513 + ... + 743511.

It is an arithmetic number, because the mean of its divisors is an integer number (1647697500).

Almost surely, 2^90651931488 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90651931488, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138406590000).

90651931488 is an abundant number, since it is smaller than the sum of its proper divisors (186161248512).

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

90651931488 is a wasteful number, since it uses less digits than its factorization.

90651931488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134056 (or 134033 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 54.

The spelling of 90651931488 in words is "ninety billion, six hundred fifty-one million, nine hundred thirty-one thousand, four hundred eighty-eight".