28906780 has 24 divisors (see below), whose sum is σ = 69376608. Its totient is φ = 9910848.

The previous prime is 28906769. The next prime is 28906807. The reversal of 28906780 is 8760982.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103099 + ... + 103378.

It is an arithmetic number, because the mean of its divisors is an integer number (2890692).

Almost surely, 2^28906780 is an apocalyptic number.

28906780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28906780 is an abundant number, since it is smaller than the sum of its proper divisors (40469828).

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

28906780 is a wasteful number, since it uses less digits than its factorization.

28906780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206493 (or 206491 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 28906780 is about 5376.5025806745. The cubic root of 28906780 is about 306.9021322225.

The spelling of 28906780 in words is "twenty-eight million, nine hundred six thousand, seven hundred eighty".