78340538 has 8 divisors (see below), whose sum is σ = 117635232. Its totient is φ = 39128796.

The previous prime is 78340517. The next prime is 78340541. The reversal of 78340538 is 83504387.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×78340538² = 12274479788258888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18320 + ... + 22187.

It is an arithmetic number, because the mean of its divisors is an integer number (14704404).

Almost surely, 2^78340538 is an apocalyptic number.

78340538 is a deficient number, since it is larger than the sum of its proper divisors (39294694).

78340538 is a wasteful number, since it uses less digits than its factorization.

78340538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41476.

The product of its (nonzero) digits is 80640, while the sum is 38.

The square root of 78340538 is about 8851.0190373764. The cubic root of 78340538 is about 427.8867614653.

The spelling of 78340538 in words is "seventy-eight million, three hundred forty thousand, five hundred thirty-eight".