78142700 has 18 divisors (see below), whose sum is σ = 169569876. Its totient is φ = 31257040.

The previous prime is 78142697. The next prime is 78142721. The reversal of 78142700 is 724187.

It is a super-2 number, since 2×78142700² = 12212563126580000, which contains 22 as substring.

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, 390614 + ... + 390813.

Almost surely, 2^78142700 is an apocalyptic number.

It is an amenable number.

78142700 is an abundant number, since it is smaller than the sum of its proper divisors (91427176).

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

78142700 is a wasteful number, since it uses less digits than its factorization.

78142700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781441 (or 781434 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 78142700 is about 8839.8359713289. The cubic root of 78142700 is about 427.5262685772.

Adding to 78142700 its reverse (724187), we get a palindrome (78866887).

The spelling of 78142700 in words is "seventy-eight million, one hundred forty-two thousand, seven hundred".