28773694440 has 96 divisors (see below), whose sum is σ = 96739180200. Its totient is φ = 7408396800.

The previous prime is 28773694387. The next prime is 28773694451. The reversal of 28773694440 is 4449637782.

28773694440 is a `hidden beast` number, since 2 + 87 + 7 + 36 + 94 + 440 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26844200964 + 1929493476 = 163842^2 + 43926^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1367611 + ... + 1388490.

Almost surely, 2^28773694440 is an apocalyptic number.

28773694440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28773694440 is an abundant number, since it is smaller than the sum of its proper divisors (67965485760).

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

28773694440 is a wasteful number, since it uses less digits than its factorization.

28773694440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756147 (or 2756140 counting only the distinct ones).

The product of its (nonzero) digits is 8128512, while the sum is 54.

The spelling of 28773694440 in words is "twenty-eight billion, seven hundred seventy-three million, six hundred ninety-four thousand, four hundred forty".