81456207 has 8 divisors (see below), whose sum is σ = 124123776. Its totient is φ = 46546392.

The previous prime is 81456181. The next prime is 81456209. The reversal of 81456207 is 70265418.

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

It is a de Polignac number, because none of the positive numbers 2^k-81456207 is a prime.

It is a super-2 number, since 2×81456207² = 13270227317653698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81456209) 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, 1939413 + ... + 1939454.

It is an arithmetic number, because the mean of its divisors is an integer number (15515472).

Almost surely, 2^81456207 is an apocalyptic number.

81456207 is a deficient number, since it is larger than the sum of its proper divisors (42667569).

81456207 is a wasteful number, since it uses less digits than its factorization.

81456207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3878877.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 81456207 is about 9025.3092467793. The cubic root of 81456207 is about 433.4856525013.

The spelling of 81456207 in words is "eighty-one million, four hundred fifty-six thousand, two hundred seven".