28783564551 has 24 divisors (see below), whose sum is σ = 47521869824. Its totient is φ = 16445624400.

The previous prime is 28783564489. The next prime is 28783564597. The reversal of 28783564551 is 15546538782.

28783564551 is a `hidden beast` number, since 2 + 8 + 7 + 83 + 5 + 6 + 4 + 551 = 666.

It is not a de Polignac number, because 28783564551 - 2⁷ = 28783564423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783564351) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 551550 + ... + 601476.

Almost surely, 2^28783564551 is an apocalyptic number.

28783564551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28783564551 is a deficient number, since it is larger than the sum of its proper divisors (18738305273).

28783564551 is a wasteful number, since it uses less digits than its factorization.

28783564551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59091 (or 59088 counting only the distinct ones).

The product of its digits is 8064000, while the sum is 54.

The spelling of 28783564551 in words is "twenty-eight billion, seven hundred eighty-three million, five hundred sixty-four thousand, five hundred fifty-one".