78887078 has 4 divisors (see below), whose sum is σ = 118330620. Its totient is φ = 39443538.

The previous prime is 78887077. The next prime is 78887117. The reversal of 78887078 is 87078887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87078887 = 7 ⋅12439841.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78887077) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19721768 + ... + 19721771.

It is an arithmetic number, because the mean of its divisors is an integer number (29582655).

Almost surely, 2^78887078 is an apocalyptic number.

78887078 is a deficient number, since it is larger than the sum of its proper divisors (39443542).

78887078 is a wasteful number, since it uses less digits than its factorization.

78887078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39443541.

The product of its (nonzero) digits is 1404928, while the sum is 53.

The square root of 78887078 is about 8881.8397868910. The cubic root of 78887078 is about 428.8795020581.

The spelling of 78887078 in words is "seventy-eight million, eight hundred eighty-seven thousand, seventy-eight".