81464526 has 48 divisors (see below), whose sum is σ = 207370800. Its totient is φ = 22786560.

The previous prime is 81464521. The next prime is 81464543. The reversal of 81464526 is 62546418.

81464526 is a `hidden beast` number, since 8 + 1 + 4 + 645 + 2 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81464521) 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, 13251 + ... + 18398.

It is an arithmetic number, because the mean of its divisors is an integer number (4320225).

Almost surely, 2^81464526 is an apocalyptic number.

81464526 is an abundant number, since it is smaller than the sum of its proper divisors (125906274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81464526 is a wasteful number, since it uses less digits than its factorization.

81464526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31681 (or 31678 counting only the distinct ones).

The product of its digits is 46080, while the sum is 36.

The square root of 81464526 is about 9025.7701056475. The cubic root of 81464526 is about 433.5004090784.

The spelling of 81464526 in words is "eighty-one million, four hundred sixty-four thousand, five hundred twenty-six".