28311816651 has 16 divisors (see below), whose sum is σ = 38312674560. Its totient is φ = 18593195040.

The previous prime is 28311816563. The next prime is 28311816661. The reversal of 28311816651 is 15661811382.

It is not a de Polignac number, because 28311816651 - 2¹⁸ = 28311554507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28311816661) 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, 203580 + ... + 313158.

It is an arithmetic number, because the mean of its divisors is an integer number (2394542160).

Almost surely, 2^28311816651 is an apocalyptic number.

28311816651 is a deficient number, since it is larger than the sum of its proper divisors (10000857909).

28311816651 is a wasteful number, since it uses less digits than its factorization.

28311816651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110866.

The product of its digits is 69120, while the sum is 42.

The spelling of 28311816651 in words is "twenty-eight billion, three hundred eleven million, eight hundred sixteen thousand, six hundred fifty-one".