28545786381 has 72 divisors (see below), whose sum is σ = 46603300800. Its totient is φ = 15534531936.

The previous prime is 28545786377. The next prime is 28545786383. The reversal of 28545786381 is 18368754582.

It is not a de Polignac number, because 28545786381 - 2² = 28545786377 is a prime.

It is a super-2 number, since 2×28545786381² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28545786383) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 124653975 + ... + 124654203.

Almost surely, 2^28545786381 is an apocalyptic number.

28545786381 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28545786381 is a deficient number, since it is larger than the sum of its proper divisors (18057514419).

28545786381 is an frugal number, since it uses more digits than its factorization.

28545786381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528 (or 262 counting only the distinct ones).

The product of its digits is 12902400, while the sum is 57.

The spelling of 28545786381 in words is "twenty-eight billion, five hundred forty-five million, seven hundred eighty-six thousand, three hundred eighty-one".