81625732 has 12 divisors (see below), whose sum is σ = 143390016. Its totient is φ = 40657160.

The previous prime is 81625693. The next prime is 81625771. The reversal of 81625732 is 23752618.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81625693) and next prime (81625771).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37744 + ... + 39847.

It is an arithmetic number, because the mean of its divisors is an integer number (11949168).

Almost surely, 2^81625732 is an apocalyptic number.

It is an amenable number.

81625732 is a deficient number, since it is larger than the sum of its proper divisors (61764284).

81625732 is a wasteful number, since it uses less digits than its factorization.

81625732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77858 (or 77856 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 81625732 is about 9034.6960103813. The cubic root of 81625732 is about 433.7861646299.

The spelling of 81625732 in words is "eighty-one million, six hundred twenty-five thousand, seven hundred thirty-two".