78812078 has 4 divisors (see below), whose sum is σ = 118218120. Its totient is φ = 39406038.

The previous prime is 78812047. The next prime is 78812131. The reversal of 78812078 is 87021887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87021887 = 6203 ⋅14029.

It is a super-2 number, since 2×78812078² = 12422687277356168, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19703018 + ... + 19703021.

It is an arithmetic number, because the mean of its divisors is an integer number (29554530).

Almost surely, 2^78812078 is an apocalyptic number.

78812078 is a deficient number, since it is larger than the sum of its proper divisors (39406042).

78812078 is a wasteful number, since it uses less digits than its factorization.

78812078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39406041.

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 78812078 is about 8877.6166846739. The cubic root of 78812078 is about 428.7435433243.

The spelling of 78812078 in words is "seventy-eight million, eight hundred twelve thousand, seventy-eight".