28690577 has 8 divisors (see below), whose sum is σ = 31199976. Its totient is φ = 26272512.

The previous prime is 28690567. The next prime is 28690609. The reversal of 28690577 is 77509682.

It can be written as a sum of positive squares in 4 ways, for example, as 5612161 + 23078416 = 2369^2 + 4804^2 .

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 28690577 - 2⁴ = 28690561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28690507) 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, 22178 + ... + 23435.

It is an arithmetic number, because the mean of its divisors is an integer number (3899997).

Almost surely, 2^28690577 is an apocalyptic number.

It is an amenable number.

28690577 is a deficient number, since it is larger than the sum of its proper divisors (2509399).

28690577 is a wasteful number, since it uses less digits than its factorization.

28690577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45667.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 28690577 is about 5356.3585578264. The cubic root of 28690577 is about 306.1350771351.

The spelling of 28690577 in words is "twenty-eight million, six hundred ninety thousand, five hundred seventy-seven".