28649769913925 has 24 divisors (see below), whose sum is σ = 36131754547680. Its totient is φ = 22528906545600.

The previous prime is 28649769913883. The next prime is 28649769913943. The reversal of 28649769913925 is 52931996794682.

It is not a de Polignac number, because 28649769913925 - 2¹² = 28649769909829 is a prime.

It is a super-2 number, since 2×28649769913925² (a number of 28 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28649769913925.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12646235 + ... + 14738615.

It is an arithmetic number, because the mean of its divisors is an integer number (1505489772820).

Almost surely, 2^{28649769913925} is an apocalyptic number.

28649769913925 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28649769913925 is a deficient number, since it is larger than the sum of its proper divisors (7481984633755).

28649769913925 is a wasteful number, since it uses less digits than its factorization.

28649769913925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2101733 (or 2101728 counting only the distinct ones).

The product of its digits is 3174474240, while the sum is 80.

The spelling of 28649769913925 in words is "twenty-eight trillion, six hundred forty-nine billion, seven hundred sixty-nine million, nine hundred thirteen thousand, nine hundred twenty-five".