81046740 has 24 divisors (see below), whose sum is σ = 226931040. Its totient is φ = 21612448.

The previous prime is 81046739. The next prime is 81046759. The reversal of 81046740 is 4764018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 81046698 and 81046707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 675330 + ... + 675449.

It is an arithmetic number, because the mean of its divisors is an integer number (9455460).

Almost surely, 2^81046740 is an apocalyptic number.

It is an amenable number.

81046740 is an abundant number, since it is smaller than the sum of its proper divisors (145884300).

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

81046740 is a wasteful number, since it uses less digits than its factorization.

81046740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350791 (or 1350789 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 81046740 is about 9002.5962921815. The cubic root of 81046740 is about 432.7580782316.

The spelling of 81046740 in words is "eighty-one million, forty-six thousand, seven hundred forty".