78000280 has 64 divisors (see below), whose sum is σ = 181764000. Its totient is φ = 30105600.

The previous prime is 78000257. The next prime is 78000287. The reversal of 78000280 is 8200087.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78000287) 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, 173496 + ... + 173944.

Almost surely, 2^78000280 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 78000280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90882000).

78000280 is an abundant number, since it is smaller than the sum of its proper divisors (103763720).

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

78000280 is a wasteful number, since it uses less digits than its factorization.

78000280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604 (or 600 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 78000280 is about 8831.7767181921. The cubic root of 78000280 is about 427.2663794275.

The spelling of 78000280 in words is "seventy-eight million, two hundred eighty", and thus it is an aban number.