28387453731 has 24 divisors (see below), whose sum is σ = 46840504320. Its totient is φ = 14973600096.

The previous prime is 28387453729. The next prime is 28387453763. The reversal of 28387453731 is 13735478382.

It is not a de Polignac number, because 28387453731 - 2¹ = 28387453729 is a prime.

It is a super-2 number, since 2×28387453731² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28387453711) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3995811 + ... + 4002908.

It is an arithmetic number, because the mean of its divisors is an integer number (1951687680).

Almost surely, 2^28387453731 is an apocalyptic number.

28387453731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28387453731 is a deficient number, since it is larger than the sum of its proper divisors (18453050589).

28387453731 is a wasteful number, since it uses less digits than its factorization.

28387453731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7998755 (or 7998742 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 51.

The spelling of 28387453731 in words is "twenty-eight billion, three hundred eighty-seven million, four hundred fifty-three thousand, seven hundred thirty-one".