28633157 has 4 divisors (see below), whose sum is σ = 32723616. Its totient is φ = 24542700.

The previous prime is 28633147. The next prime is 28633223. The reversal of 28633157 is 75133682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28633157 - 2¹⁴ = 28616773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28633127) 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, 2045219 + ... + 2045232.

It is an arithmetic number, because the mean of its divisors is an integer number (8180904).

Almost surely, 2^28633157 is an apocalyptic number.

It is an amenable number.

28633157 is a deficient number, since it is larger than the sum of its proper divisors (4090459).

28633157 is an equidigital number, since it uses as much as digits as its factorization.

28633157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090458.

The product of its digits is 30240, while the sum is 35.

The square root of 28633157 is about 5350.9958886174. The cubic root of 28633157 is about 305.9307125224.

The spelling of 28633157 in words is "twenty-eight million, six hundred thirty-three thousand, one hundred fifty-seven".