78394210 has 8 divisors (see below), whose sum is σ = 141109596. Its totient is φ = 31357680.

The previous prime is 78394207. The next prime is 78394213. The reversal of 78394210 is 1249387.

It is an interprime number because it is at equal distance from previous prime (78394207) and next prime (78394213).

It can be written as a sum of positive squares in 2 ways, for example, as 71927361 + 6466849 = 8481^2 + 2543^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78394210² = 12291304323048200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78394213) 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, 3919701 + ... + 3919720.

Almost surely, 2^78394210 is an apocalyptic number.

78394210 is a deficient number, since it is larger than the sum of its proper divisors (62715386).

78394210 is a wasteful number, since it uses less digits than its factorization.

78394210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7839428.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 78394210 is about 8854.0504855123. The cubic root of 78394210 is about 427.9844558654.

The spelling of 78394210 in words is "seventy-eight million, three hundred ninety-four thousand, two hundred ten".