78442 has 16 divisors (see below), whose sum is σ = 145152. Its totient is φ = 30960.

The previous prime is 78439. The next prime is 78467. The reversal of 78442 is 24487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34 + ... + 397.

It is an arithmetic number, because the mean of its divisors is an integer number (9072).

2⁷⁸⁴⁴² is an apocalyptic number.

78442 is a deficient number, since it is larger than the sum of its proper divisors (66710).

78442 is a wasteful number, since it uses less digits than its factorization.

78442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453.

The product of its digits is 1792, while the sum is 25.

The square root of 78442 is about 280.0749899580. The cubic root of 78442 is about 42.8071406259.

The spelling of 78442 in words is "seventy-eight thousand, four hundred forty-two".