28312766407 has 4 divisors (see below), whose sum is σ = 28326321760. Its totient is φ = 28299211056.

The previous prime is 28312766393. The next prime is 28312766429. The reversal of 28312766407 is 70466721382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70466721382 = 2 ⋅35233360691.

It is a cyclic number.

It is not a de Polignac number, because 28312766407 - 2²³ = 28304377799 is a prime.

It is a super-2 number, since 2×28312766407² (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 (28312766437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6774543 + ... + 6778720.

It is an arithmetic number, because the mean of its divisors is an integer number (7081580440).

Almost surely, 2^28312766407 is an apocalyptic number.

28312766407 is a deficient number, since it is larger than the sum of its proper divisors (13555353).

28312766407 is a wasteful number, since it uses less digits than its factorization.

28312766407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13555352.

The product of its (nonzero) digits is 677376, while the sum is 46.

The spelling of 28312766407 in words is "twenty-eight billion, three hundred twelve million, seven hundred sixty-six thousand, four hundred seven".