28779120 has 60 divisors (see below), whose sum is σ = 96652296. Its totient is φ = 7674240.

The previous prime is 28779109. The next prime is 28779137. The reversal of 28779120 is 2197782.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 19266 + ... + 20705.

Almost surely, 2^28779120 is an apocalyptic number.

28779120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28779120 is an abundant number, since it is smaller than the sum of its proper divisors (67873176).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28779120 is a wasteful number, since it uses less digits than its factorization.

28779120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39990 (or 39981 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 28779120 is about 5364.6174141312. The cubic root of 28779120 is about 306.4496784699.

The spelling of 28779120 in words is "twenty-eight million, seven hundred seventy-nine thousand, one hundred twenty".