81707394 has 16 divisors (see below), whose sum is σ = 163507968. Its totient is φ = 27220272.

The previous prime is 81707393. The next prime is 81707401. The reversal of 81707394 is 49370718.

It is a plaindrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (81707393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13519 + ... + 18605.

It is an arithmetic number, because the mean of its divisors is an integer number (10219248).

Almost surely, 2^81707394 is an apocalyptic number.

81707394 is an abundant number, since it is smaller than the sum of its proper divisors (81800574).

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

81707394 is a wasteful number, since it uses less digits than its factorization.

81707394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7769.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 81707394 is about 9039.2142357619. The cubic root of 81707394 is about 433.9307760503.

The spelling of 81707394 in words is "eighty-one million, seven hundred seven thousand, three hundred ninety-four".