28312766409 has 8 divisors (see below), whose sum is σ = 37832961760. Its totient is φ = 18833874336.

The previous prime is 28312766393. The next prime is 28312766429. The reversal of 28312766409 is 90466721382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28312766409 - 2⁴ = 28312766393 is a prime.

It is a super-2 number, since 2×28312766409² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28312766429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10324219 + ... + 10326960.

It is an arithmetic number, because the mean of its divisors is an integer number (4729120220).

Almost surely, 2^28312766409 is an apocalyptic number.

It is an amenable number.

28312766409 is a deficient number, since it is larger than the sum of its proper divisors (9520195351).

28312766409 is a wasteful number, since it uses less digits than its factorization.

28312766409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20651639.

The product of its (nonzero) digits is 870912, while the sum is 48.

The spelling of 28312766409 in words is "twenty-eight billion, three hundred twelve million, seven hundred sixty-six thousand, four hundred nine".