28774566155 has 8 divisors (see below), whose sum is σ = 34531510032. Its totient is φ = 23018299168.

The previous prime is 28774566137. The next prime is 28774566173. The reversal of 28774566155 is 55166547782.

It is an interprime number because it is at equal distance from previous prime (28774566137) and next prime (28774566173).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28774566155 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28774566155.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70457 + ... + 250026.

It is an arithmetic number, because the mean of its divisors is an integer number (4316438754).

Almost surely, 2^28774566155 is an apocalyptic number.

28774566155 is a deficient number, since it is larger than the sum of its proper divisors (5756943877).

28774566155 is a wasteful number, since it uses less digits than its factorization.

28774566155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 338445.

The product of its digits is 14112000, while the sum is 56.

The spelling of 28774566155 in words is "twenty-eight billion, seven hundred seventy-four million, five hundred sixty-six thousand, one hundred fifty-five".