81246377460 has 48 divisors (see below), whose sum is σ = 227519070912. Its totient is φ = 21662918400.

The previous prime is 81246377453. The next prime is 81246377491. The reversal of 81246377460 is 6477364218.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 407400 + ... + 573120.

It is an arithmetic number, because the mean of its divisors is an integer number (4739980644).

Almost surely, 2^81246377460 is an apocalyptic number.

It is an amenable number.

81246377460 is an abundant number, since it is smaller than the sum of its proper divisors (146272693452).

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

81246377460 is a wasteful number, since it uses less digits than its factorization.

81246377460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173904 (or 173902 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 48.

The spelling of 81246377460 in words is "eighty-one billion, two hundred forty-six million, three hundred seventy-seven thousand, four hundred sixty".