81073407 has 8 divisors (see below), whose sum is σ = 109168560. Its totient is φ = 53513600.

The previous prime is 81073403. The next prime is 81073423. The reversal of 81073407 is 70437018.

It is a happy number.

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 81073407 - 2² = 81073403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81073403) 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, 133482 + ... + 134087.

It is an arithmetic number, because the mean of its divisors is an integer number (13646070).

Almost surely, 2^81073407 is an apocalyptic number.

81073407 is a deficient number, since it is larger than the sum of its proper divisors (28095153).

81073407 is a wasteful number, since it uses less digits than its factorization.

81073407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267673.

The product of its (nonzero) digits is 4704, while the sum is 30.

The square root of 81073407 is about 9004.0772431160. The cubic root of 81073407 is about 432.8055368305.

The spelling of 81073407 in words is "eighty-one million, seventy-three thousand, four hundred seven".