81507627 has 10 divisors (see below), whose sum is σ = 121758428. Its totient is φ = 54338364.

The previous prime is 81507623. The next prime is 81507659. The reversal of 81507627 is 72670518.

It is not a de Polignac number, because 81507627 - 2² = 81507623 is a prime.

It is a super-2 number, since 2×81507627² = 13286986518342258, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81507591 and 81507600.

It is not an unprimeable number, because it can be changed into a prime (81507623) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 503053 + ... + 503214.

Almost surely, 2^81507627 is an apocalyptic number.

81507627 is a deficient number, since it is larger than the sum of its proper divisors (40250801).

81507627 is a wasteful number, since it uses less digits than its factorization.

81507627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1006279 (or 1006270 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 81507627 is about 9028.1574532127. The cubic root of 81507627 is about 433.5768472856.

The spelling of 81507627 in words is "eighty-one million, five hundred seven thousand, six hundred twenty-seven".