81726707 has 4 divisors (see below), whose sum is σ = 82490616. Its totient is φ = 80962800.

The previous prime is 81726691. The next prime is 81726731. The reversal of 81726707 is 70762718.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 81726707 - 2⁴ = 81726691 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81726737) 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, 381794 + ... + 382007.

It is an arithmetic number, because the mean of its divisors is an integer number (20622654).

Almost surely, 2^81726707 is an apocalyptic number.

81726707 is a deficient number, since it is larger than the sum of its proper divisors (763909).

81726707 is a wasteful number, since it uses less digits than its factorization.

81726707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 763908.

The product of its (nonzero) digits is 32928, while the sum is 38.

The square root of 81726707 is about 9040.2824624013. The cubic root of 81726707 is about 433.9649624500.

The spelling of 81726707 in words is "eighty-one million, seven hundred twenty-six thousand, seven hundred seven".