90436721179 has 12 divisors (see below), whose sum is σ = 107440241184. Its totient is φ = 75867885744.

The previous prime is 90436721153. The next prime is 90436721317. The reversal of 90436721179 is 97112763409.

It is not a de Polignac number, because 90436721179 - 2¹³ = 90436712987 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90436721129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19632244 + ... + 19636849.

It is an arithmetic number, because the mean of its divisors is an integer number (8953353432).

Almost surely, 2^90436721179 is an apocalyptic number.

90436721179 is a deficient number, since it is larger than the sum of its proper divisors (17003520005).

90436721179 is a wasteful number, since it uses less digits than its factorization.

90436721179 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39269154 (or 39269147 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 49.

The spelling of 90436721179 in words is "ninety billion, four hundred thirty-six million, seven hundred twenty-one thousand, one hundred seventy-nine".