28418204929 has 9 divisors (see below), whose sum is σ = 29436997993. Its totient is φ = 27433546672.

The previous prime is 28418204873. The next prime is 28418204933. The reversal of 28418204929 is 92940281482.

The square root of 28418204929 is 168577.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1406625025 + 27011579904 = 37505^2 + 164352^2 .

It is not a de Polignac number, because 28418204929 - 2²¹ = 28416107777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28418294929) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4885827 + ... + 4891639.

Almost surely, 2^28418204929 is an apocalyptic number.

28418204929 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28418204929 is the 168577-th square number.

28418204929 is the 84289-th centered octagonal number.

It is an amenable number.

28418204929 is a deficient number, since it is larger than the sum of its proper divisors (1018793064).

28418204929 is an frugal number, since it uses more digits than its factorization.

28418204929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11684 (or 5842 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 49.

Multiplying 28418204929 by its sum of digits (49), we get a square (1392492041521 = 1180039²).

The spelling of 28418204929 in words is "twenty-eight billion, four hundred eighteen million, two hundred four thousand, nine hundred twenty-nine".