81622752 has 48 divisors (see below), whose sum is σ = 221179392. Its totient is φ = 26328960.

The previous prime is 81622741. The next prime is 81622769. The reversal of 81622752 is 25722618.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10738 + ... + 16689.

It is an arithmetic number, because the mean of its divisors is an integer number (4607904).

Almost surely, 2^81622752 is an apocalyptic number.

It is an amenable number.

81622752 is an abundant number, since it is smaller than the sum of its proper divisors (139556640).

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

81622752 is a wasteful number, since it uses less digits than its factorization.

81622752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27471 (or 27463 counting only the distinct ones).

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

The square root of 81622752 is about 9034.5310891047. The cubic root of 81622752 is about 433.7808856635.

The spelling of 81622752 in words is "eighty-one million, six hundred twenty-two thousand, seven hundred fifty-two".