81652388 has 12 divisors (see below), whose sum is σ = 147501312. Its totient is φ = 39509160.

The previous prime is 81652381. The next prime is 81652391. The reversal of 81652388 is 88325618.

It is a super-2 number, since 2×81652388² = 13334224932205088, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81652381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329120 + ... + 329367.

It is an arithmetic number, because the mean of its divisors is an integer number (12291776).

Almost surely, 2^81652388 is an apocalyptic number.

It is an amenable number.

81652388 is a deficient number, since it is larger than the sum of its proper divisors (65848924).

81652388 is a wasteful number, since it uses less digits than its factorization.

81652388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658522 (or 658520 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 81652388 is about 9036.1710917844. The cubic root of 81652388 is about 433.8333790939.

The spelling of 81652388 in words is "eighty-one million, six hundred fifty-two thousand, three hundred eighty-eight".