78115000 has 80 divisors (see below), whose sum is σ = 194000400. Its totient is φ = 29376000.

The previous prime is 78114941. The next prime is 78115001. The reversal of 78115000 is 51187.

It is a super-2 number, since 2×78115000² = 12203906450000000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78115001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 84541 + ... + 85459.

It is an arithmetic number, because the mean of its divisors is an integer number (2425005).

Almost surely, 2^78115000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78115000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97000200).

78115000 is an abundant number, since it is smaller than the sum of its proper divisors (115885400).

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

78115000 is a wasteful number, since it uses less digits than its factorization.

78115000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 962 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 78115000 is about 8838.2690613038. The cubic root of 78115000 is about 427.4757461475.

Adding to 78115000 its reverse (51187), we get a palindrome (78166187).

The spelling of 78115000 in words is "seventy-eight million, one hundred fifteen thousand".