90070309 has 4 divisors (see below), whose sum is σ = 102937504. Its totient is φ = 77203116.

The previous prime is 90070303. The next prime is 90070313. The reversal of 90070309 is 90307009.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 90070309 - 2⁷ = 90070181 is a prime.

It is a super-2 number, since 2×90070309² = 16225321126710962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90070303) 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, 6433587 + ... + 6433600.

It is an arithmetic number, because the mean of its divisors is an integer number (25734376).

Almost surely, 2^90070309 is an apocalyptic number.

It is an amenable number.

90070309 is a deficient number, since it is larger than the sum of its proper divisors (12867195).

90070309 is a wasteful number, since it uses less digits than its factorization.

90070309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12867194.

The product of its (nonzero) digits is 1701, while the sum is 28.

The square root of 90070309 is about 9490.5378667386. The cubic root of 90070309 is about 448.2571417198.

The spelling of 90070309 in words is "ninety million, seventy thousand, three hundred nine".