78128780 has 24 divisors (see below), whose sum is σ = 168073920. Its totient is φ = 30488960.

The previous prime is 78128717. The next prime is 78128789. The reversal of 78128780 is 8782187.

It is a super-2 number, since 2×78128780² = 12208212528576800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (78128789) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46820 + ... + 48459.

It is an arithmetic number, because the mean of its divisors is an integer number (7003080).

Almost surely, 2^78128780 is an apocalyptic number.

It is an amenable number.

78128780 is an abundant number, since it is smaller than the sum of its proper divisors (89945140).

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

78128780 is a wasteful number, since it uses less digits than its factorization.

78128780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95329 (or 95327 counting only the distinct ones).

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

The square root of 78128780 is about 8839.0485913361. The cubic root of 78128780 is about 427.5008811810.

The spelling of 78128780 in words is "seventy-eight million, one hundred twenty-eight thousand, seven hundred eighty".