28409157 has 32 divisors (see below), whose sum is σ = 48706560. Its totient is φ = 16029360.

The previous prime is 28409153. The next prime is 28409177. The reversal of 28409157 is 75190482.

It is not a de Polignac number, because 28409157 - 2² = 28409153 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28409153) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14782 + ... + 16592.

It is an arithmetic number, because the mean of its divisors is an integer number (1522080).

Almost surely, 2^28409157 is an apocalyptic number.

28409157 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28409157 is a deficient number, since it is larger than the sum of its proper divisors (20297403).

28409157 is a wasteful number, since it uses less digits than its factorization.

28409157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28409157 is about 5330.0241087635. The cubic root of 28409157 is about 305.1308477360.

The spelling of 28409157 in words is "twenty-eight million, four hundred nine thousand, one hundred fifty-seven".