81264332 has 6 divisors (see below), whose sum is σ = 142212588. Its totient is φ = 40632164.

The previous prime is 81264331. The next prime is 81264341. The reversal of 81264332 is 23346218.

It is a junction number, because it is equal to n+sod(n) for n = 81264295 and 81264304.

It is not an unprimeable number, because it can be changed into a prime (81264331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10158038 + ... + 10158045.

It is an arithmetic number, because the mean of its divisors is an integer number (23702098).

Almost surely, 2^81264332 is an apocalyptic number.

It is an amenable number.

81264332 is a deficient number, since it is larger than the sum of its proper divisors (60948256).

81264332 is a wasteful number, since it uses less digits than its factorization.

81264332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20316087 (or 20316085 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 81264332 is about 9014.6731499262. The cubic root of 81264332 is about 433.1450177145.

The spelling of 81264332 in words is "eighty-one million, two hundred sixty-four thousand, three hundred thirty-two".