78345663 has 16 divisors (see below), whose sum is σ = 116384256. Its totient is φ = 46471040.

The previous prime is 78345653. The next prime is 78345667. The reversal of 78345663 is 36654387.

It is not a de Polignac number, because 78345663 - 2¹⁰ = 78344639 is a prime.

It is a super-2 number, since 2×78345663² = 12276085821819138, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78345667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23706 + ... + 26807.

It is an arithmetic number, because the mean of its divisors is an integer number (7274016).

Almost surely, 2^78345663 is an apocalyptic number.

78345663 is a deficient number, since it is larger than the sum of its proper divisors (38038593).

78345663 is a wasteful number, since it uses less digits than its factorization.

78345663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50574.

The product of its digits is 362880, while the sum is 42.

The square root of 78345663 is about 8851.3085473279. The cubic root of 78345663 is about 427.8960919766.

The spelling of 78345663 in words is "seventy-eight million, three hundred forty-five thousand, six hundred sixty-three".