28649974771 has 36 divisors (see below), whose sum is σ = 34682222736. Its totient is φ = 23600982240.

The previous prime is 28649974751. The next prime is 28649974799. The reversal of 28649974771 is 17747994682.

It is a happy number.

It is not a de Polignac number, because 28649974771 - 2¹¹ = 28649972723 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28649974751) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 990405 + ... + 1018921.

It is an arithmetic number, because the mean of its divisors is an integer number (963395076).

Almost surely, 2^28649974771 is an apocalyptic number.

28649974771 is a deficient number, since it is larger than the sum of its proper divisors (6032247965).

28649974771 is a wasteful number, since it uses less digits than its factorization.

28649974771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28600 (or 28570 counting only the distinct ones).

The product of its digits is 42674688, while the sum is 64.

The spelling of 28649974771 in words is "twenty-eight billion, six hundred forty-nine million, nine hundred seventy-four thousand, seven hundred seventy-one".