78415542 has 12 divisors (see below), whose sum is σ = 169900380. Its totient is φ = 26138508.

The previous prime is 78415529. The next prime is 78415553. The reversal of 78415542 is 24551487.

78415542 is a `hidden beast` number, since 78 + 41 + 5 + 542 = 666.

It is a super-2 number, since 2×78415542² = 12297994454307528, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78415497 and 78415506.

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 2178192 + ... + 2178227.

It is an arithmetic number, because the mean of its divisors is an integer number (14158365).

Almost surely, 2^78415542 is an apocalyptic number.

78415542 is an abundant number, since it is smaller than the sum of its proper divisors (91484838).

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

78415542 is a wasteful number, since it uses less digits than its factorization.

78415542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356427 (or 4356424 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 78415542 is about 8855.2550499689. The cubic root of 78415542 is about 428.0232722373.

The spelling of 78415542 in words is "seventy-eight million, four hundred fifteen thousand, five hundred forty-two".