81345762 has 32 divisors (see below), whose sum is σ = 182381760. Its totient is φ = 26873280.

The previous prime is 81345749. The next prime is 81345773. The reversal of 81345762 is 26754318.

81345762 is a `hidden beast` number, since 81 + 3 + 4 + 576 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 564 + ... + 12767.

It is an arithmetic number, because the mean of its divisors is an integer number (5699430).

Almost surely, 2^81345762 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81345762, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91190880).

81345762 is an abundant number, since it is smaller than the sum of its proper divisors (101035998).

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

81345762 is a wasteful number, since it uses less digits than its factorization.

81345762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13455 (or 13449 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 81345762 is about 9019.1885444313. The cubic root of 81345762 is about 433.2896454312.

The spelling of 81345762 in words is "eighty-one million, three hundred forty-five thousand, seven hundred sixty-two".