78199542 has 48 divisors (see below), whose sum is σ = 175938048. Its totient is φ = 25084080.

The previous prime is 78199531. The next prime is 78199549. The reversal of 78199542 is 24599187.

It is a super-2 number, since 2×78199542² = 12230336738019528, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78199549) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54243 + ... + 55665.

It is an arithmetic number, because the mean of its divisors is an integer number (3665376).

Almost surely, 2^78199542 is an apocalyptic number.

78199542 is an abundant number, since it is smaller than the sum of its proper divisors (97738506).

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

78199542 is a wasteful number, since it uses less digits than its factorization.

78199542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1545 (or 1542 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 78199542 is about 8843.0504917704. The cubic root of 78199542 is about 427.6299061452.

The spelling of 78199542 in words is "seventy-eight million, one hundred ninety-nine thousand, five hundred forty-two".