81279374 has 32 divisors (see below), whose sum is σ = 137237760. Its totient is φ = 35784000.

The previous prime is 81279353. The next prime is 81279377. The reversal of 81279374 is 47397218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81279377) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 142562 + ... + 143130.

It is an arithmetic number, because the mean of its divisors is an integer number (4288680).

Almost surely, 2^81279374 is an apocalyptic number.

81279374 is a deficient number, since it is larger than the sum of its proper divisors (55958386).

81279374 is a wasteful number, since it uses less digits than its factorization.

81279374 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776.

The product of its digits is 84672, while the sum is 41.

The square root of 81279374 is about 9015.5074177774. The cubic root of 81279374 is about 433.1717410638.

The spelling of 81279374 in words is "eighty-one million, two hundred seventy-nine thousand, three hundred seventy-four".