28778156 has 36 divisors (see below), whose sum is σ = 56887824. Its totient is φ = 12719520.

The previous prime is 28778111. The next prime is 28778171. The reversal of 28778156 is 65187782.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17105 + ... + 18711.

Almost surely, 2^28778156 is an apocalyptic number.

It is an amenable number.

28778156 is a deficient number, since it is larger than the sum of its proper divisors (28109668).

28778156 is a wasteful number, since it uses less digits than its factorization.

28778156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670 (or 1657 counting only the distinct ones).

The product of its digits is 188160, while the sum is 44.

The square root of 28778156 is about 5364.5275654059. The cubic root of 28778156 is about 306.4462567671.

The spelling of 28778156 in words is "twenty-eight million, seven hundred seventy-eight thousand, one hundred fifty-six".