28876457 has 4 divisors (see below), whose sum is σ = 29023236. Its totient is φ = 28729680.

The previous prime is 28876451. The next prime is 28876483. The reversal of 28876457 is 75467882.

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 21752896 + 7123561 = 4664^2 + 2669^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28876457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28876451) 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, 73094 + ... + 73487.

It is an arithmetic number, because the mean of its divisors is an integer number (7255809).

Almost surely, 2^28876457 is an apocalyptic number.

It is an amenable number.

28876457 is a deficient number, since it is larger than the sum of its proper divisors (146779).

28876457 is a wasteful number, since it uses less digits than its factorization.

28876457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146778.

The product of its digits is 752640, while the sum is 47.

The square root of 28876457 is about 5373.6818848905. The cubic root of 28876457 is about 306.7947819826.

The spelling of 28876457 in words is "twenty-eight million, eight hundred seventy-six thousand, four hundred fifty-seven".