81214742 has 8 divisors (see below), whose sum is σ = 139225296. Its totient is φ = 34806312.

The previous prime is 81214733. The next prime is 81214751. The reversal of 81214742 is 24741218.

It is an interprime number because it is at equal distance from previous prime (81214733) and next prime (81214751).

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, 2900513 + ... + 2900540.

It is an arithmetic number, because the mean of its divisors is an integer number (17403162).

Almost surely, 2^81214742 is an apocalyptic number.

81214742 is a deficient number, since it is larger than the sum of its proper divisors (58010554).

81214742 is a wasteful number, since it uses less digits than its factorization.

81214742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5801062.

The product of its digits is 3584, while the sum is 29.

The square root of 81214742 is about 9011.9222144890. The cubic root of 81214742 is about 433.0568936402.

The spelling of 81214742 in words is "eighty-one million, two hundred fourteen thousand, seven hundred forty-two".