28763820 has 36 divisors (see below), whose sum is σ = 87250800. Its totient is φ = 7670304.

The previous prime is 28763807. The next prime is 28763843. The reversal of 28763820 is 2836782.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

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, 79720 + ... + 80079.

Almost surely, 2^28763820 is an apocalyptic number.

28763820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28763820 is an abundant number, since it is smaller than the sum of its proper divisors (58486980).

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

28763820 is a wasteful number, since it uses less digits than its factorization.

28763820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159814 (or 159809 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 28763820 is about 5363.1912141933. The cubic root of 28763820 is about 306.3953623405.

The spelling of 28763820 in words is "twenty-eight million, seven hundred sixty-three thousand, eight hundred twenty".