28370817769 has 24 divisors (see below), whose sum is σ = 34226641800. Its totient is φ = 23420275200.

The previous prime is 28370817743. The next prime is 28370817901. The reversal of 28370817769 is 96771807382.

It can be written as a sum of positive squares in 4 ways, for example, as 8739445225 + 19631372544 = 93485^2 + 140112^2 .

It is not a de Polignac number, because 28370817769 - 2⁷ = 28370817641 is a prime.

It is a super-2 number, since 2×28370817769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28370817569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 544927 + ... + 594715.

It is an arithmetic number, because the mean of its divisors is an integer number (1426110075).

Almost surely, 2^28370817769 is an apocalyptic number.

28370817769 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28370817769 is a deficient number, since it is larger than the sum of its proper divisors (5855824031).

28370817769 is a wasteful number, since it uses less digits than its factorization.

28370817769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50233 (or 50226 counting only the distinct ones).

The product of its (nonzero) digits is 7112448, while the sum is 58.

The spelling of 28370817769 in words is "twenty-eight billion, three hundred seventy million, eight hundred seventeen thousand, seven hundred sixty-nine".