28664478037 has 6 divisors (see below), whose sum is σ = 30870095298. Its totient is φ = 26458954704.

The previous prime is 28664477983. The next prime is 28664478109. The reversal of 28664478037 is 73087446682.

It can be written as a sum of positive squares in 3 ways, for example, as 44635761 + 28619842276 = 6681^2 + 169174^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28664478037 is a prime.

It is a super-2 number, since 2×28664478037² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664476037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 586963 + ... + 633919.

It is an arithmetic number, because the mean of its divisors is an integer number (5145015883).

Almost surely, 2^28664478037 is an apocalyptic number.

It is an amenable number.

28664478037 is a deficient number, since it is larger than the sum of its proper divisors (2205617261).

28664478037 is an frugal number, since it uses more digits than its factorization.

28664478037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93927 (or 46970 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 55.

The spelling of 28664478037 in words is "twenty-eight billion, six hundred sixty-four million, four hundred seventy-eight thousand, thirty-seven".