81746607 has 16 divisors (see below), whose sum is σ = 115090560. Its totient is φ = 51468192.

The previous prime is 81746551. The next prime is 81746647. The reversal of 81746607 is 70664718.

It is not a de Polignac number, because 81746607 - 2⁸ = 81746351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81746647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17713 + ... + 21845.

It is an arithmetic number, because the mean of its divisors is an integer number (7193160).

Almost surely, 2^81746607 is an apocalyptic number.

81746607 is a deficient number, since it is larger than the sum of its proper divisors (33343953).

81746607 is a wasteful number, since it uses less digits than its factorization.

81746607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4502.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 81746607 is about 9041.3830247369. The cubic root of 81746607 is about 434.0001822789. Note that the first 3 decimals are identical.

The spelling of 81746607 in words is "eighty-one million, seven hundred forty-six thousand, six hundred seven".