78438297 has 16 divisors (see below), whose sum is σ = 119688192. Its totient is φ = 44760720.

The previous prime is 78438293. The next prime is 78438319. The reversal of 78438297 is 79283487.

78438297 = 2079² + 2080² + ... + 2096².

It is not a de Polignac number, because 78438297 - 2² = 78438293 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78438293) 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, 16522 + ... + 20732.

It is an arithmetic number, because the mean of its divisors is an integer number (7480512).

Almost surely, 2^78438297 is an apocalyptic number.

It is an amenable number.

78438297 is a deficient number, since it is larger than the sum of its proper divisors (41249895).

78438297 is a wasteful number, since it uses less digits than its factorization.

78438297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5108.

The product of its digits is 677376, while the sum is 48.

The square root of 78438297 is about 8856.5397870726. The cubic root of 78438297 is about 428.0646701854.

The spelling of 78438297 in words is "seventy-eight million, four hundred thirty-eight thousand, two hundred ninety-seven".