81402047 has 8 divisors (see below), whose sum is σ = 82371072. Its totient is φ = 80438400.

The previous prime is 81402031. The next prime is 81402067. The reversal of 81402047 is 74020418.

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

It is a cyclic number.

It is not a de Polignac number, because 81402047 - 2⁴ = 81402031 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81402017) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34547 + ... + 36827.

It is an arithmetic number, because the mean of its divisors is an integer number (10296384).

Almost surely, 2^81402047 is an apocalyptic number.

81402047 is a deficient number, since it is larger than the sum of its proper divisors (969025).

81402047 is a wasteful number, since it uses less digits than its factorization.

81402047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2689.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 81402047 is about 9022.3082966611. The cubic root of 81402047 is about 433.3895567417.

The spelling of 81402047 in words is "eighty-one million, four hundred two thousand, forty-seven".