81225762 has 48 divisors (see below), whose sum is σ = 174326880. Its totient is φ = 25224192.

The previous prime is 81225757. The next prime is 81225791. The reversal of 81225762 is 26752218.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240858 + ... + 241194.

It is an arithmetic number, because the mean of its divisors is an integer number (3631810).

Almost surely, 2^81225762 is an apocalyptic number.

81225762 is an abundant number, since it is smaller than the sum of its proper divisors (93101118).

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

81225762 is a wasteful number, since it uses less digits than its factorization.

81225762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515 (or 498 counting only the distinct ones).

The product of its digits is 13440, while the sum is 33.

The square root of 81225762 is about 9012.5336060400. The cubic root of 81225762 is about 433.0764798672.

The spelling of 81225762 in words is "eighty-one million, two hundred twenty-five thousand, seven hundred sixty-two".