78709542 has 16 divisors (see below), whose sum is σ = 164263680. Its totient is φ = 25095752.

The previous prime is 78709531. The next prime is 78709597. The reversal of 78709542 is 24590787.

It is a junction number, because it is equal to n+sod(n) for n = 78709494 and 78709503.

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, 285042 + ... + 285317.

It is an arithmetic number, because the mean of its divisors is an integer number (10266480).

Almost surely, 2^78709542 is an apocalyptic number.

78709542 is an abundant number, since it is smaller than the sum of its proper divisors (85554138).

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

78709542 is a wasteful number, since it uses less digits than its factorization.

78709542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570387.

The product of its (nonzero) digits is 141120, while the sum is 42.

The square root of 78709542 is about 8871.8398317373. The cubic root of 78709542 is about 428.5575281523.

The spelling of 78709542 in words is "seventy-eight million, seven hundred nine thousand, five hundred forty-two".