90708981645 has 32 divisors (see below), whose sum is σ = 145553184000. Its totient is φ = 48238654464.

The previous prime is 90708981637. The next prime is 90708981647. The reversal of 90708981645 is 54618980709.

It is not a de Polignac number, because 90708981645 - 2³ = 90708981637 is a prime.

It is a super-3 number, since 3×90708981645³ (a number of 34 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90708981647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16553016 + ... + 16558494.

It is an arithmetic number, because the mean of its divisors is an integer number (4548537000).

Almost surely, 2^90708981645 is an apocalyptic number.

It is an amenable number.

90708981645 is a deficient number, since it is larger than the sum of its proper divisors (54844202355).

90708981645 is a wasteful number, since it uses less digits than its factorization.

90708981645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8469.

The product of its (nonzero) digits is 4354560, while the sum is 57.

The spelling of 90708981645 in words is "ninety billion, seven hundred eight million, nine hundred eighty-one thousand, six hundred forty-five".