78378867 has 16 divisors (see below), whose sum is σ = 132705280. Its totient is φ = 44787816.

The previous prime is 78378847. The next prime is 78378869. The reversal of 78378867 is 76887387.

It is not a de Polignac number, because 78378867 - 2⁶ = 78378803 is a prime.

It is a super-2 number, since 2×78378867² = 12286493584407378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378869) 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, 207163 + ... + 207540.

It is an arithmetic number, because the mean of its divisors is an integer number (8294080).

Almost surely, 2^78378867 is an apocalyptic number.

78378867 is a deficient number, since it is larger than the sum of its proper divisors (54326413).

78378867 is a wasteful number, since it uses less digits than its factorization.

78378867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414719 (or 414713 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 78378867 is about 8853.1840035097. The cubic root of 78378867 is about 427.9565329106.

The spelling of 78378867 in words is "seventy-eight million, three hundred seventy-eight thousand, eight hundred sixty-seven".