90644157087 has 16 divisors (see below), whose sum is σ = 131884841088. Its totient is φ = 54919688480.

The previous prime is 90644157073. The next prime is 90644157103. The reversal of 90644157087 is 78075144609.

It is a cyclic number.

It is not a de Polignac number, because 90644157087 - 2⁷ = 90644156959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90644155087) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 289773 + ... + 515030.

It is an arithmetic number, because the mean of its divisors is an integer number (8242802568).

Almost surely, 2^90644157087 is an apocalyptic number.

90644157087 is a deficient number, since it is larger than the sum of its proper divisors (41240684001).

90644157087 is a wasteful number, since it uses less digits than its factorization.

90644157087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808230.

The product of its (nonzero) digits is 1693440, while the sum is 51.

The spelling of 90644157087 in words is "ninety billion, six hundred forty-four million, one hundred fifty-seven thousand, eighty-seven".