81430604 has 12 divisors (see below), whose sum is σ = 143035200. Its totient is φ = 40563408.

The previous prime is 81430589. The next prime is 81430607. The reversal of 81430604 is 40603418.

It is not an unprimeable number, because it can be changed into a prime (81430607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36764 + ... + 38915.

It is an arithmetic number, because the mean of its divisors is an integer number (11919600).

Almost surely, 2^81430604 is an apocalyptic number.

It is an amenable number.

81430604 is a deficient number, since it is larger than the sum of its proper divisors (61604596).

81430604 is a wasteful number, since it uses less digits than its factorization.

81430604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75952 (or 75950 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 81430604 is about 9023.8907351541. The cubic root of 81430604 is about 433.4402305640.

The spelling of 81430604 in words is "eighty-one million, four hundred thirty thousand, six hundred four".