90698257 has 8 divisors (see below), whose sum is σ = 97761384. Its totient is φ = 83647488.

The previous prime is 90698239. The next prime is 90698287. The reversal of 90698257 is 75289609.

It can be written as a sum of positive squares in 4 ways, for example, as 37466641 + 53231616 = 6121^2 + 7296^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90698257 - 2⁷ = 90698129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90698287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17073 + ... + 21745.

It is an arithmetic number, because the mean of its divisors is an integer number (12220173).

Almost surely, 2^90698257 is an apocalyptic number.

It is an amenable number.

90698257 is a deficient number, since it is larger than the sum of its proper divisors (7063127).

90698257 is a wasteful number, since it uses less digits than its factorization.

90698257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179.

The product of its (nonzero) digits is 272160, while the sum is 46.

The square root of 90698257 is about 9523.5632512206. The cubic root of 90698257 is about 449.2964429768.

The spelling of 90698257 in words is "ninety million, six hundred ninety-eight thousand, two hundred fifty-seven".