81382634 has 8 divisors (see below), whose sum is σ = 122112228. Its totient is φ = 40678560.

The previous prime is 81382627. The next prime is 81382667. The reversal of 81382634 is 43628318.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63952009 + 17430625 = 7997^2 + 4175^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 81382594 and 81382603.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9524 + ... + 15920.

Almost surely, 2^81382634 is an apocalyptic number.

81382634 is a deficient number, since it is larger than the sum of its proper divisors (40729594).

81382634 is a wasteful number, since it uses less digits than its factorization.

81382634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12760.

The product of its digits is 27648, while the sum is 35.

The square root of 81382634 is about 9021.2323991792. The cubic root of 81382634 is about 433.3551019965.

The spelling of 81382634 in words is "eighty-one million, three hundred eighty-two thousand, six hundred thirty-four".