28788777650 has 24 divisors (see below), whose sum is σ = 53552080260. Its totient is φ = 11514445760.

The previous prime is 28788777623. The next prime is 28788777673. The reversal of 28788777650 is 5677788782.

It can be written as a sum of positive squares in 6 ways, for example, as 291623929 + 28497153721 = 17077^2 + 168811^2 .

It is a super-2 number, since 2×28788777650² (a number of 22 digits) contains 22 as substring.

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, 734756 + ... + 772944.

Almost surely, 2^28788777650 is an apocalyptic number.

28788777650 is a deficient number, since it is larger than the sum of its proper divisors (24763302610).

28788777650 is a wasteful number, since it uses less digits than its factorization.

28788777650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53278 (or 53273 counting only the distinct ones).

The product of its (nonzero) digits is 73758720, while the sum is 65.

The spelling of 28788777650 in words is "twenty-eight billion, seven hundred eighty-eight million, seven hundred seventy-seven thousand, six hundred fifty".