28772020 has 24 divisors (see below), whose sum is σ = 61012224. Its totient is φ = 11396256.

The previous prime is 28771997. The next prime is 28772063. The reversal of 28772020 is 2027782.

It is a self number, because there is not a number n which added to its sum of digits gives 28772020.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4924 + ... + 9043.

It is an arithmetic number, because the mean of its divisors is an integer number (2542176).

Almost surely, 2^28772020 is an apocalyptic number.

28772020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28772020 is an abundant number, since it is smaller than the sum of its proper divisors (32240204).

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

28772020 is a wasteful number, since it uses less digits than its factorization.

28772020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14079 (or 14077 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 28772020 is about 5363.9556299433. The cubic root of 28772020 is about 306.4244753404.

The spelling of 28772020 in words is "twenty-eight million, seven hundred seventy-two thousand, twenty".