81255004 has 6 divisors (see below), whose sum is σ = 142196264. Its totient is φ = 40627500.

The previous prime is 81254969. The next prime is 81255007. The reversal of 81255004 is 40055218.

It is a self number, because there is not a number n which added to its sum of digits gives 81255004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81255007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10156872 + ... + 10156879.

Almost surely, 2^81255004 is an apocalyptic number.

It is an amenable number.

81255004 is a deficient number, since it is larger than the sum of its proper divisors (60941260).

81255004 is a wasteful number, since it uses less digits than its factorization.

81255004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20313755 (or 20313753 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 81255004 is about 9014.1557563645. The cubic root of 81255004 is about 433.1284440992.

The spelling of 81255004 in words is "eighty-one million, two hundred fifty-five thousand, four".