28412557 has 2 divisors, whose sum is σ = 28412558. Its totient is φ = 28412556.

The previous prime is 28412537. The next prime is 28412569. The reversal of 28412557 is 75521482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 7123561 = 4614^2 + 2669^2 .

It is a cyclic number.

It is not a de Polignac number, because 28412557 - 2¹⁵ = 28379789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28412507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14206278 + 14206279.

It is an arithmetic number, because the mean of its divisors is an integer number (14206279).

Almost surely, 2^28412557 is an apocalyptic number.

It is an amenable number.

28412557 is a deficient number, since it is larger than the sum of its proper divisors (1).

28412557 is an equidigital number, since it uses as much as digits as its factorization.

28412557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 22400, while the sum is 34.

The square root of 28412557 is about 5330.3430471218. The cubic root of 28412557 is about 305.1430199087.

The spelling of 28412557 in words is "twenty-eight million, four hundred twelve thousand, five hundred fifty-seven".