28440666837 has 128 divisors (see below), whose sum is σ = 48076554240. Its totient is φ = 16468920000.

The previous prime is 28440666811. The next prime is 28440666869. The reversal of 28440666837 is 73866604482.

It is not a de Polignac number, because 28440666837 - 2⁸ = 28440666581 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28440166837) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 188348712 + ... + 188348862.

It is an arithmetic number, because the mean of its divisors is an integer number (375598080).

Almost surely, 2^28440666837 is an apocalyptic number.

28440666837 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28440666837 is a deficient number, since it is larger than the sum of its proper divisors (19635887403).

28440666837 is a wasteful number, since it uses less digits than its factorization.

28440666837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 446 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 54.

The spelling of 28440666837 in words is "twenty-eight billion, four hundred forty million, six hundred sixty-six thousand, eight hundred thirty-seven".