90910069 has 4 divisors (see below), whose sum is σ = 92400460. Its totient is φ = 89419680.

The previous prime is 90910037. The next prime is 90910081. The reversal of 90910069 is 96001909.

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 2 ways, for example, as 8191044 + 82719025 = 2862^2 + 9095^2 .

It is a cyclic number.

It is not a de Polignac number, because 90910069 - 2⁵ = 90910037 is a prime.

It is a super-2 number, since 2×90910069² = 16529281291169522, 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 (90910009) 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, 745104 + ... + 745225.

It is an arithmetic number, because the mean of its divisors is an integer number (23100115).

Almost surely, 2^90910069 is an apocalyptic number.

It is an amenable number.

90910069 is a deficient number, since it is larger than the sum of its proper divisors (1490391).

90910069 is a wasteful number, since it uses less digits than its factorization.

90910069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1490390.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 90910069 is about 9534.6771838380. The cubic root of 90910069 is about 449.6459255912.

The spelling of 90910069 in words is "ninety million, nine hundred ten thousand, sixty-nine".