28477079731 has 4 divisors (see below), whose sum is σ = 28478160792. Its totient is φ = 28475998672.

The previous prime is 28477079647. The next prime is 28477079737. The reversal of 28477079731 is 13797077482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28477079731 - 2²³ = 28468691123 is a prime.

It is a super-2 number, since 2×28477079731² (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 (28477079737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 500005 + ... + 554038.

It is an arithmetic number, because the mean of its divisors is an integer number (7119540198).

Almost surely, 2^28477079731 is an apocalyptic number.

28477079731 is a deficient number, since it is larger than the sum of its proper divisors (1081061).

28477079731 is a wasteful number, since it uses less digits than its factorization.

28477079731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081060.

The product of its (nonzero) digits is 4148928, while the sum is 55.

The spelling of 28477079731 in words is "twenty-eight billion, four hundred seventy-seven million, seventy-nine thousand, seven hundred thirty-one".