90212672745 has 24 divisors (see below), whose sum is σ = 168396990216. Its totient is φ = 44412392448.

The previous prime is 90212672729. The next prime is 90212672773. The reversal of 90212672745 is 54727621209.

It can be written as a sum of positive squares in 4 ways, for example, as 714172176 + 89498500569 = 26724^2 + 299163^2 .

It is not a de Polignac number, because 90212672745 - 2⁴ = 90212672729 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 90212672745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 77104264 + ... + 77105433.

It is an arithmetic number, because the mean of its divisors is an integer number (7016541259).

Almost surely, 2^90212672745 is an apocalyptic number.

It is an amenable number.

90212672745 is a deficient number, since it is larger than the sum of its proper divisors (78184317471).

90212672745 is a wasteful number, since it uses less digits than its factorization.

90212672745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154209721 (or 154209718 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The spelling of 90212672745 in words is "ninety billion, two hundred twelve million, six hundred seventy-two thousand, seven hundred forty-five".