28157428 has 36 divisors (see below), whose sum is σ = 55708128. Its totient is φ = 12423840.

The previous prime is 28157383. The next prime is 28157429. The reversal of 28157428 is 82475182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14643 + ... + 16453.

It is an arithmetic number, because the mean of its divisors is an integer number (1547448).

Almost surely, 2^28157428 is an apocalyptic number.

It is an amenable number.

28157428 is a deficient number, since it is larger than the sum of its proper divisors (27550700).

28157428 is a wasteful number, since it uses less digits than its factorization.

28157428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1864 (or 1849 counting only the distinct ones).

The product of its digits is 35840, while the sum is 37.

The square root of 28157428 is about 5306.3573192916. The cubic root of 28157428 is about 304.2269340848.

The spelling of 28157428 in words is "twenty-eight million, one hundred fifty-seven thousand, four hundred twenty-eight".