90436561672 has 16 divisors (see below), whose sum is σ = 170505398700. Its totient is φ = 44968455360.

The previous prime is 90436561613. The next prime is 90436561673. The reversal of 90436561672 is 27616563409.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 88276728996 + 2159832676 = 297114^2 + 46474^2 .

It is not an unprimeable number, because it can be changed into a prime (90436561673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31226647 + ... + 31229542.

Almost surely, 2^90436561672 is an apocalyptic number.

It is an amenable number.

90436561672 is a deficient number, since it is larger than the sum of its proper divisors (80068837028).

90436561672 is a wasteful number, since it uses less digits than its factorization.

90436561672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62456376 (or 62456372 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 49.

The spelling of 90436561672 in words is "ninety billion, four hundred thirty-six million, five hundred sixty-one thousand, six hundred seventy-two".