28902557 has 2 divisors, whose sum is σ = 28902558. Its totient is φ = 28902556.

The previous prime is 28902541. The next prime is 28902563. The reversal of 28902557 is 75520982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26925721 + 1976836 = 5189^2 + 1406^2 .

It is a cyclic number.

It is not a de Polignac number, because 28902557 - 2⁴ = 28902541 is a prime.

It is a super-2 number, since 2×28902557² = 1670715602276498, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28902557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28902157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14451278 + 14451279.

It is an arithmetic number, because the mean of its divisors is an integer number (14451279).

Almost surely, 2^28902557 is an apocalyptic number.

It is an amenable number.

28902557 is a deficient number, since it is larger than the sum of its proper divisors (1).

28902557 is an equidigital number, since it uses as much as digits as its factorization.

28902557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 28902557 is about 5376.1098389077. The cubic root of 28902557 is about 306.8871863537.

The spelling of 28902557 in words is "twenty-eight million, nine hundred two thousand, five hundred fifty-seven".