78387078 has 64 divisors (see below), whose sum is σ = 196411392. Its totient is φ = 20261280.

The previous prime is 78387077. The next prime is 78387091. The reversal of 78387078 is 87078387.

It is a super-2 number, since 2×78387078² = 12289067994756168, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78387077) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 176725 + ... + 177167.

It is an arithmetic number, because the mean of its divisors is an integer number (3068928).

Almost surely, 2^78387078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78387078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98205696).

78387078 is an abundant number, since it is smaller than the sum of its proper divisors (118024314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78387078 is a wasteful number, since it uses less digits than its factorization.

78387078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849.

The product of its (nonzero) digits is 526848, while the sum is 48.

The square root of 78387078 is about 8853.6477228315. The cubic root of 78387078 is about 427.9714766853.

The spelling of 78387078 in words is "seventy-eight million, three hundred eighty-seven thousand, seventy-eight".