28880840407 has 4 divisors (see below), whose sum is σ = 28881196696. Its totient is φ = 28880484120.

The previous prime is 28880840333. The next prime is 28880840413. The reversal of 28880840407 is 70404808882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28880840407 - 2¹⁵ = 28880807639 is a prime.

It is a super-2 number, since 2×28880840407² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28880840477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8932 + ... + 240502.

It is an arithmetic number, because the mean of its divisors is an integer number (7220299174).

Almost surely, 2^28880840407 is an apocalyptic number.

28880840407 is a deficient number, since it is larger than the sum of its proper divisors (356289).

28880840407 is a wasteful number, since it uses less digits than its factorization.

28880840407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356288.

The product of its (nonzero) digits is 917504, while the sum is 49.

The spelling of 28880840407 in words is "twenty-eight billion, eight hundred eighty million, eight hundred forty thousand, four hundred seven".