78214237 has 6 divisors (see below), whose sum is σ = 81763262. Its totient is φ = 74813112.

The previous prime is 78214219. The next prime is 78214243. The reversal of 78214237 is 73241287.

It can be written as a sum of positive squares in only one way, i.e., 46977316 + 31236921 = 6854^2 + 5589^2 .

It is not a de Polignac number, because 78214237 - 2¹⁵ = 78181469 is a prime.

It is a super-2 number, since 2×78214237² = 12234933738984338, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78214267) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 73398 + ... + 74455.

Almost surely, 2^78214237 is an apocalyptic number.

It is an amenable number.

78214237 is a deficient number, since it is larger than the sum of its proper divisors (3549025).

78214237 is a wasteful number, since it uses less digits than its factorization.

78214237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147899 (or 147876 counting only the distinct ones).

The product of its digits is 18816, while the sum is 34.

The square root of 78214237 is about 8843.8813311803. The cubic root of 78214237 is about 427.6566907347.

The spelling of 78214237 in words is "seventy-eight million, two hundred fourteen thousand, two hundred thirty-seven".