28925525709 has 16 divisors (see below), whose sum is σ = 44330308800. Its totient is φ = 18618728688.

The previous prime is 28925525701. The next prime is 28925525711. The reversal of 28925525709 is 90752552982.

It is a happy number.

28925525709 is a `hidden beast` number, since 2 + 89 + 2 + 552 + 5 + 7 + 0 + 9 = 666.

It is not a de Polignac number, because 28925525709 - 2³ = 28925525701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28925525701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18470179 + ... + 18471744.

It is an arithmetic number, because the mean of its divisors is an integer number (2770644300).

Almost surely, 2^28925525709 is an apocalyptic number.

28925525709 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28925525709 is a deficient number, since it is larger than the sum of its proper divisors (15404783091).

28925525709 is a wasteful number, since it uses less digits than its factorization.

28925525709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36941961 (or 36941955 counting only the distinct ones).

The product of its (nonzero) digits is 4536000, while the sum is 54.

The spelling of 28925525709 in words is "twenty-eight billion, nine hundred twenty-five million, five hundred twenty-five thousand, seven hundred nine".