90723145 has 8 divisors (see below), whose sum is σ = 109013256. Its totient is φ = 72481536.

The previous prime is 90723097. The next prime is 90723187. The reversal of 90723145 is 54132709.

It can be written as a sum of positive squares in 4 ways, for example, as 13564489 + 77158656 = 3683^2 + 8784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90723145 - 2²³ = 82334537 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7872 + ... + 15601.

It is an arithmetic number, because the mean of its divisors is an integer number (13626657).

Almost surely, 2^90723145 is an apocalyptic number.

It is an amenable number.

90723145 is a deficient number, since it is larger than the sum of its proper divisors (18290111).

90723145 is a wasteful number, since it uses less digits than its factorization.

90723145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24251.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 90723145 is about 9524.8698153833. The cubic root of 90723145 is about 449.3375355240.

The spelling of 90723145 in words is "ninety million, seven hundred twenty-three thousand, one hundred forty-five".