81672526 has 32 divisors (see below), whose sum is σ = 143690400. Its totient is φ = 34473600.

The previous prime is 81672467. The next prime is 81672529. The reversal of 81672526 is 62527618.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81672529) 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, 11476 + ... + 17176.

It is an arithmetic number, because the mean of its divisors is an integer number (4490325).

Almost surely, 2^81672526 is an apocalyptic number.

81672526 is a deficient number, since it is larger than the sum of its proper divisors (62017874).

81672526 is a wasteful number, since it uses less digits than its factorization.

81672526 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5764.

The product of its digits is 40320, while the sum is 37.

The square root of 81672526 is about 9037.2853224848. The cubic root of 81672526 is about 433.8690417310.

The spelling of 81672526 in words is "eighty-one million, six hundred seventy-two thousand, five hundred twenty-six".