90072706 has 4 divisors (see below), whose sum is σ = 135109062. Its totient is φ = 45036352.

The previous prime is 90072691. The next prime is 90072733. The reversal of 90072706 is 60727009.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 84805681 + 5267025 = 9209^2 + 2295^2 .

It is a super-2 number, since 2×90072706² = 16226184732324872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 as a sum of consecutive naturals, namely, 22518175 + ... + 22518178.

Almost surely, 2^90072706 is an apocalyptic number.

90072706 is a deficient number, since it is larger than the sum of its proper divisors (45036356).

90072706 is a wasteful number, since it uses less digits than its factorization.

90072706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45036355.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 90072706 is about 9490.6641495735. The cubic root of 90072706 is about 448.2611181054.

The spelling of 90072706 in words is "ninety million, seventy-two thousand, seven hundred six".