81280604 has 24 divisors (see below), whose sum is σ = 150902640. Its totient is φ = 38174976.

The previous prime is 81280603. The next prime is 81280607. The reversal of 81280604 is 40608218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81280603) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50687 + ... + 52265.

It is an arithmetic number, because the mean of its divisors is an integer number (6287610).

Almost surely, 2^81280604 is an apocalyptic number.

It is an amenable number.

81280604 is a deficient number, since it is larger than the sum of its proper divisors (69622036).

81280604 is a wasteful number, since it uses less digits than its factorization.

81280604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2357 (or 2355 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 81280604 is about 9015.5756333137. The cubic root of 81280604 is about 433.1739261141.

The spelling of 81280604 in words is "eighty-one million, two hundred eighty thousand, six hundred four".