78128050 has 144 divisors (see below), whose sum is σ = 199487232. Its totient is φ = 22377600.

The previous prime is 78128041. The next prime is 78128051. The reversal of 78128050 is 5082187.

It is a super-2 number, since 2×78128050² = 12207984393605000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78128051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 350239 + ... + 350461.

It is an arithmetic number, because the mean of its divisors is an integer number (1385328).

Almost surely, 2^78128050 is an apocalyptic number.

78128050 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78128050 is an abundant number, since it is smaller than the sum of its proper divisors (121359182).

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

78128050 is a wasteful number, since it uses less digits than its factorization.

78128050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 31.

The square root of 78128050 is about 8839.0072972026. The cubic root of 78128050 is about 427.4995497185.

The spelling of 78128050 in words is "seventy-eight million, one hundred twenty-eight thousand, fifty".