90290705 has 4 divisors (see below), whose sum is σ = 108348852. Its totient is φ = 72232560.

The previous prime is 90290699. The next prime is 90290731. The reversal of 90290705 is 50709209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50709209 = 593 ⋅85513.

It can be written as a sum of positive squares in 2 ways, for example, as 18905104 + 71385601 = 4348^2 + 8449^2 .

It is not a de Polignac number, because 90290705 - 2⁸ = 90290449 is a prime.

It is a super-2 number, since 2×90290705² = 16304822818794050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9029066 + ... + 9029075.

It is an arithmetic number, because the mean of its divisors is an integer number (27087213).

Almost surely, 2^90290705 is an apocalyptic number.

It is an amenable number.

90290705 is a deficient number, since it is larger than the sum of its proper divisors (18058147).

90290705 is a wasteful number, since it uses less digits than its factorization.

90290705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18058146.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 90290705 is about 9502.1421269101. The cubic root of 90290705 is about 448.6224622886.

The spelling of 90290705 in words is "ninety million, two hundred ninety thousand, seven hundred five".