28865029431 has 32 divisors (see below), whose sum is σ = 44498460160. Its totient is φ = 16302145536.

The previous prime is 28865029421. The next prime is 28865029451. The reversal of 28865029431 is 13492056882.

It is not a de Polignac number, because 28865029431 - 2¹¹ = 28865027383 is a prime.

It is a super-2 number, since 2×28865029431² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28865029421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1557240 + ... + 1575666.

It is an arithmetic number, because the mean of its divisors is an integer number (1390576880).

Almost surely, 2^28865029431 is an apocalyptic number.

28865029431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28865029431 is a deficient number, since it is larger than the sum of its proper divisors (15633430729).

28865029431 is a wasteful number, since it uses less digits than its factorization.

28865029431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19303.

The product of its (nonzero) digits is 829440, while the sum is 48.

The spelling of 28865029431 in words is "twenty-eight billion, eight hundred sixty-five million, twenty-nine thousand, four hundred thirty-one".