78540042 has 24 divisors (see below), whose sum is σ = 182726496. Its totient is φ = 22439928.

The previous prime is 78540041. The next prime is 78540047. The reversal of 78540042 is 24004587.

It is a junction number, because it is equal to n+sod(n) for n = 78539991 and 78540009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78540041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133278 + ... + 133865.

It is an arithmetic number, because the mean of its divisors is an integer number (7613604).

Almost surely, 2^78540042 is an apocalyptic number.

78540042 is an abundant number, since it is smaller than the sum of its proper divisors (104186454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78540042 is a wasteful number, since it uses less digits than its factorization.

78540042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267162 (or 267155 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 78540042 is about 8862.2819860350. The cubic root of 78540042 is about 428.2496759948.

The spelling of 78540042 in words is "seventy-eight million, five hundred forty thousand, forty-two".