78142858 has 16 divisors (see below), whose sum is σ = 126011520. Its totient is φ = 36226656.

The previous prime is 78142819. The next prime is 78142861. The reversal of 78142858 is 85824187.

It is a super-2 number, since 2×78142858² = 12212612512816328, which contains 22 as substring.

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, 20091 + ... + 23662.

It is an arithmetic number, because the mean of its divisors is an integer number (7875720).

Almost surely, 2^78142858 is an apocalyptic number.

78142858 is a deficient number, since it is larger than the sum of its proper divisors (47868662).

78142858 is a wasteful number, since it uses less digits than its factorization.

78142858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43821.

The product of its digits is 143360, while the sum is 43.

The square root of 78142858 is about 8839.8449081418. The cubic root of 78142858 is about 427.5265567215.

The spelling of 78142858 in words is "seventy-eight million, one hundred forty-two thousand, eight hundred fifty-eight".