81287294 has 8 divisors (see below), whose sum is σ = 133015608. Its totient is φ = 36948760.

The previous prime is 81287279. The next prime is 81287303. The reversal of 81287294 is 49278218.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1847417 + ... + 1847460.

It is an arithmetic number, because the mean of its divisors is an integer number (16626951).

Almost surely, 2^81287294 is an apocalyptic number.

81287294 is a deficient number, since it is larger than the sum of its proper divisors (51728314).

81287294 is a wasteful number, since it uses less digits than its factorization.

81287294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694890.

The product of its digits is 64512, while the sum is 41.

The square root of 81287294 is about 9015.9466502414. The cubic root of 81287294 is about 433.1858102698.

The spelling of 81287294 in words is "eighty-one million, two hundred eighty-seven thousand, two hundred ninety-four".