78327893 has 4 divisors (see below), whose sum is σ = 89517600. Its totient is φ = 67138188.

The previous prime is 78327889. The next prime is 78327901. The reversal of 78327893 is 39872387.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78327893 - 2² = 78327889 is a prime.

It is a super-2 number, since 2×78327893² = 12270517643638898, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78327833) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5594843 + ... + 5594856.

It is an arithmetic number, because the mean of its divisors is an integer number (22379400).

Almost surely, 2^78327893 is an apocalyptic number.

It is an amenable number.

78327893 is a deficient number, since it is larger than the sum of its proper divisors (11189707).

78327893 is a wasteful number, since it uses less digits than its factorization.

78327893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11189706.

The product of its digits is 508032, while the sum is 47.

The square root of 78327893 is about 8850.3046840208. The cubic root of 78327893 is about 427.8637383946.

The spelling of 78327893 in words is "seventy-eight million, three hundred twenty-seven thousand, eight hundred ninety-three".