90070731 has 8 divisors (see below), whose sum is σ = 133438160. Its totient is φ = 60047136.

The previous prime is 90070699. The next prime is 90070741. The reversal of 90070731 is 13707009.

It is not a de Polignac number, because 90070731 - 2⁵ = 90070699 is a prime.

It is a super-2 number, since 2×90070731² = 16225473165748722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 3335953 = 90070731 / (9 + 0 + 0 + 7 + 0 + 7 + 3 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90070695 and 90070704.

It is not an unprimeable number, because it can be changed into a prime (90070741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1667950 + ... + 1668003.

It is an arithmetic number, because the mean of its divisors is an integer number (16679770).

Almost surely, 2^90070731 is an apocalyptic number.

90070731 is a deficient number, since it is larger than the sum of its proper divisors (43367429).

90070731 is a wasteful number, since it uses less digits than its factorization.

90070731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3335962 (or 3335956 counting only the distinct ones).

The product of its (nonzero) digits is 1323, while the sum is 27.

The square root of 90070731 is about 9490.5600993830. The cubic root of 90070731 is about 448.2578417812.

It can be divided in two parts, 900 and 70731, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 90070731 in words is "ninety million, seventy thousand, seven hundred thirty-one".