90702813 has 4 divisors (see below), whose sum is σ = 120937088. Its totient is φ = 60468540.

The previous prime is 90702767. The next prime is 90702841. The reversal of 90702813 is 31820709.

It is a happy number.

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 not a de Polignac number, because 90702813 - 2¹³ = 90694621 is a prime.

It is a super-2 number, since 2×90702813² = 16454000572225938, 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 (90702853) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 15117133 + ... + 15117138.

It is an arithmetic number, because the mean of its divisors is an integer number (30234272).

Almost surely, 2^90702813 is an apocalyptic number.

It is an amenable number.

90702813 is a deficient number, since it is larger than the sum of its proper divisors (30234275).

90702813 is a wasteful number, since it uses less digits than its factorization.

90702813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30234274.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 90702813 is about 9523.8024444021. The cubic root of 90702813 is about 449.3039659450.

The spelling of 90702813 in words is "ninety million, seven hundred two thousand, eight hundred thirteen".