78213867 has 8 divisors (see below), whose sum is σ = 104470080. Its totient is φ = 52050120.

The previous prime is 78213827. The next prime is 78213887. The reversal of 78213867 is 76831287.

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

It is not a de Polignac number, because 78213867 - 2⁶ = 78213803 is a prime.

It is a super-2 number, since 2×78213867² = 12234817982187378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78213827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21117 + ... + 24542.

It is an arithmetic number, because the mean of its divisors is an integer number (13058760).

Almost surely, 2^78213867 is an apocalyptic number.

78213867 is a deficient number, since it is larger than the sum of its proper divisors (26256213).

78213867 is a wasteful number, since it uses less digits than its factorization.

78213867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46233.

The product of its digits is 112896, while the sum is 42.

The square root of 78213867 is about 8843.8604127383. The cubic root of 78213867 is about 427.6560163765.

The spelling of 78213867 in words is "seventy-eight million, two hundred thirteen thousand, eight hundred sixty-seven".