28772280 has 64 divisors (see below), whose sum is σ = 95911200. Its totient is φ = 7672320.

The previous prime is 28772257. The next prime is 28772299. The reversal of 28772280 is 8227782.

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 15 ways as a sum of consecutive naturals, for example, 12241 + ... + 14400.

Almost surely, 2^28772280 is an apocalyptic number.

28772280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28772280 is an abundant number, since it is smaller than the sum of its proper divisors (67138920).

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

28772280 is a wasteful number, since it uses less digits than its factorization.

28772280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26661 (or 26651 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28772280 is about 5363.9798657340. The cubic root of 28772280 is about 306.4253983450.

The spelling of 28772280 in words is "twenty-eight million, seven hundred seventy-two thousand, two hundred eighty".