28387156777 has 16 divisors (see below), whose sum is σ = 34162191360. Its totient is φ = 23042971152.

The previous prime is 28387156729. The next prime is 28387156781. The reversal of 28387156777 is 77765178382.

It is a cyclic number.

It is not a de Polignac number, because 28387156777 - 2³¹ = 26239673129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28387156727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349338 + ... + 422860.

It is an arithmetic number, because the mean of its divisors is an integer number (2135136960).

Almost surely, 2^28387156777 is an apocalyptic number.

It is an amenable number.

28387156777 is a deficient number, since it is larger than the sum of its proper divisors (5775034583).

28387156777 is a wasteful number, since it uses less digits than its factorization.

28387156777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76452.

The product of its digits is 27659520, while the sum is 61.

The spelling of 28387156777 in words is "twenty-eight billion, three hundred eighty-seven million, one hundred fifty-six thousand, seven hundred seventy-seven".