28637773506 has 32 divisors (see below), whose sum is σ = 64029942720. Its totient is φ = 9487357632.

The previous prime is 28637773471. The next prime is 28637773513. The reversal of 28637773506 is 60537773682.

28637773506 is a `hidden beast` number, since 2 + 8 + 63 + 7 + 7 + 73 + 506 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1617975 + ... + 1635578.

It is an arithmetic number, because the mean of its divisors is an integer number (2000935710).

Almost surely, 2^28637773506 is an apocalyptic number.

28637773506 is an abundant number, since it is smaller than the sum of its proper divisors (35392169214).

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

28637773506 is a wasteful number, since it uses less digits than its factorization.

28637773506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3253727 (or 3253721 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 28637773506 in words is "twenty-eight billion, six hundred thirty-seven million, seven hundred seventy-three thousand, five hundred six".