28077780600 has 96 divisors (see below), whose sum is σ = 96712374000. Its totient is φ = 7487406720.

The previous prime is 28077780583. The next prime is 28077780611. The reversal of 28077780600 is 608777082.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2594395 + ... + 2605194.

Almost surely, 2^28077780600 is an apocalyptic number.

28077780600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28077780600 is an abundant number, since it is smaller than the sum of its proper divisors (68634593400).

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

28077780600 is a wasteful number, since it uses less digits than its factorization.

28077780600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199614 (or 5199599 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The spelling of 28077780600 in words is "twenty-eight billion, seventy-seven million, seven hundred eighty thousand, six hundred".