28131757461 has 8 divisors (see below), whose sum is σ = 41676677760. Its totient is φ = 18754504956.

The previous prime is 28131757439. The next prime is 28131757501. The reversal of 28131757461 is 16475713182.

28131757461 is a `hidden beast` number, since 2 + 8 + 1 + 3 + 17 + 574 + 61 = 666.

It is not a de Polignac number, because 28131757461 - 2⁶ = 28131757397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28131757421) 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, 520958445 + ... + 520958498.

It is an arithmetic number, because the mean of its divisors is an integer number (5209584720).

Almost surely, 2^28131757461 is an apocalyptic number.

It is an amenable number.

28131757461 is a deficient number, since it is larger than the sum of its proper divisors (13544920299).

28131757461 is a wasteful number, since it uses less digits than its factorization.

28131757461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041916952 (or 1041916946 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The spelling of 28131757461 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred fifty-seven thousand, four hundred sixty-one".