78416437 has 4 divisors (see below), whose sum is σ = 85545216. Its totient is φ = 71287660.

The previous prime is 78416423. The next prime is 78416483. The reversal of 78416437 is 73461487.

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, and also an emirpimes, since its reverse is a distinct semiprime: 73461487 = 11 ⋅6678317.

It is a cyclic number.

It is not a de Polignac number, because 78416437 - 2¹⁹ = 77892149 is a prime.

It is a super-2 number, since 2×78416437² = 12298275183549938, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78416437.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78516437) 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, 3564373 + ... + 3564394.

It is an arithmetic number, because the mean of its divisors is an integer number (21386304).

Almost surely, 2^78416437 is an apocalyptic number.

It is an amenable number.

78416437 is a deficient number, since it is larger than the sum of its proper divisors (7128779).

78416437 is a wasteful number, since it uses less digits than its factorization.

78416437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128778.

The product of its digits is 112896, while the sum is 40.

The square root of 78416437 is about 8855.3055847893. The cubic root of 78416437 is about 428.0249006534.

The spelling of 78416437 in words is "seventy-eight million, four hundred sixteen thousand, four hundred thirty-seven".