78891142 has 16 divisors (see below), whose sum is σ = 131284800. Its totient is φ = 35251240.

The previous prime is 78891119. The next prime is 78891143. The reversal of 78891142 is 24119887.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 78891095 and 78891104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78891143) 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, 29092 + ... + 31687.

It is an arithmetic number, because the mean of its divisors is an integer number (8205300).

Almost surely, 2^78891142 is an apocalyptic number.

78891142 is a deficient number, since it is larger than the sum of its proper divisors (52393658).

78891142 is a wasteful number, since it uses less digits than its factorization.

78891142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60851.

The product of its digits is 32256, while the sum is 40.

The square root of 78891142 is about 8882.0685653737. The cubic root of 78891142 is about 428.8868667470.

The spelling of 78891142 in words is "seventy-eight million, eight hundred ninety-one thousand, one hundred forty-two".