78143128 has 16 divisors (see below), whose sum is σ = 167449680. Its totient is φ = 33489888.

The previous prime is 78143123. The next prime is 78143137. The reversal of 78143128 is 82134187.

It is a happy number.

It is a super-2 number, since 2×78143128² = 12212696907248768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78143093 and 78143102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78143123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 697651 + ... + 697762.

It is an arithmetic number, because the mean of its divisors is an integer number (10465605).

Almost surely, 2^78143128 is an apocalyptic number.

It is an amenable number.

78143128 is an abundant number, since it is smaller than the sum of its proper divisors (89306552).

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

78143128 is a wasteful number, since it uses less digits than its factorization.

78143128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1395426 (or 1395422 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 78143128 is about 8839.8601798897. The cubic root of 78143128 is about 427.5270491189.

The spelling of 78143128 in words is "seventy-eight million, one hundred forty-three thousand, one hundred twenty-eight".