78345837 has 6 divisors (see below), whose sum is σ = 113166222. Its totient is φ = 52230552.

The previous prime is 78345811. The next prime is 78345853. The reversal of 78345837 is 73854387.

It can be written as a sum of positive squares in only one way, i.e., 77898276 + 447561 = 8826^2 + 669^2 .

It is not a de Polignac number, because 78345837 - 2⁸ = 78345581 is a prime.

It is a super-2 number, since 2×78345837² = 12276140350461138, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78345792 and 78345801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78345737) 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, 4352538 + ... + 4352555.

It is an arithmetic number, because the mean of its divisors is an integer number (18861037).

Almost surely, 2^78345837 is an apocalyptic number.

It is an amenable number.

78345837 is a deficient number, since it is larger than the sum of its proper divisors (34820385).

78345837 is a wasteful number, since it uses less digits than its factorization.

78345837 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8705099 (or 8705096 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 78345837 is about 8851.3183763776. The cubic root of 78345837 is about 427.8964087517.

The spelling of 78345837 in words is "seventy-eight million, three hundred forty-five thousand, eight hundred thirty-seven".