78572143 has 4 divisors (see below), whose sum is σ = 84616168. Its totient is φ = 72528120.

The previous prime is 78572119. The next prime is 78572149. The reversal of 78572143 is 34127587.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78572143 is a prime.

It is a super-2 number, since 2×78572143² = 12347163311224898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78572149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3021993 + ... + 3022018.

It is an arithmetic number, because the mean of its divisors is an integer number (21154042).

Almost surely, 2^78572143 is an apocalyptic number.

78572143 is a deficient number, since it is larger than the sum of its proper divisors (6044025).

78572143 is a wasteful number, since it uses less digits than its factorization.

78572143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6044024.

The product of its digits is 47040, while the sum is 37.

The square root of 78572143 is about 8864.0929033940. The cubic root of 78572143 is about 428.3080129908.

It can be divided in two parts, 7857 and 2143, that added together give a 4-th power (10000 = 10⁴).

The spelling of 78572143 in words is "seventy-eight million, five hundred seventy-two thousand, one hundred forty-three".