78456281 has 8 divisors (see below), whose sum is σ = 81432000. Its totient is φ = 75498640.

The previous prime is 78456277. The next prime is 78456283. The reversal of 78456281 is 18265487.

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 78456281 - 2² = 78456277 is a prime.

It is a super-2 number, since 2×78456281² = 12310776056701922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78456283) 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, 4670 + ... + 13368.

It is an arithmetic number, because the mean of its divisors is an integer number (10179000).

Almost surely, 2^78456281 is an apocalyptic number.

It is an amenable number.

78456281 is a deficient number, since it is larger than the sum of its proper divisors (2975719).

78456281 is a wasteful number, since it uses less digits than its factorization.

78456281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9039.

The product of its digits is 107520, while the sum is 41.

The square root of 78456281 is about 8857.5550238201. Note that the first 3 decimals coincide. The cubic root of 78456281 is about 428.0973826361.

The spelling of 78456281 in words is "seventy-eight million, four hundred fifty-six thousand, two hundred eighty-one".