90678517 has 4 divisors (see below), whose sum is σ = 91510540. Its totient is φ = 89846496.

The previous prime is 90678499. The next prime is 90678547. The reversal of 90678517 is 71587609.

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 82464561 + 8213956 = 9081^2 + 2866^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90678517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90678547) 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, 415848 + ... + 416065.

It is an arithmetic number, because the mean of its divisors is an integer number (22877635).

Almost surely, 2^90678517 is an apocalyptic number.

It is an amenable number.

90678517 is a deficient number, since it is larger than the sum of its proper divisors (832023).

90678517 is a wasteful number, since it uses less digits than its factorization.

90678517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 832022.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 90678517 is about 9522.5268180247. The cubic root of 90678517 is about 449.2638449402.

The spelling of 90678517 in words is "ninety million, six hundred seventy-eight thousand, five hundred seventeen".