78327438 has 16 divisors (see below), whose sum is σ = 179034240. Its totient is φ = 22379256.

The previous prime is 78327437. The next prime is 78327439. The reversal of 78327438 is 83472387.

It is an interprime number because it is at equal distance from previous prime (78327437) and next prime (78327439).

It is a super-2 number, since 2×78327438² = 12270375087287688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 1864939 = 78327438 / (7 + 8 + 3 + 2 + 7 + 4 + 3 + 8).

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78327438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78327433) 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, 932428 + ... + 932511.

It is an arithmetic number, because the mean of its divisors is an integer number (11189640).

Almost surely, 2^78327438 is an apocalyptic number.

78327438 is an abundant number, since it is smaller than the sum of its proper divisors (100706802).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78327438 is a wasteful number, since it uses less digits than its factorization.

78327438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864951.

The product of its digits is 225792, while the sum is 42.

The square root of 78327438 is about 8850.2789786537. The cubic root of 78327438 is about 427.8629099184.

The spelling of 78327438 in words is "seventy-eight million, three hundred twenty-seven thousand, four hundred thirty-eight".