78141861 has 24 divisors (see below), whose sum is σ = 132509760. Its totient is φ = 44583048.

The previous prime is 78141853. The next prime is 78141881. The reversal of 78141861 is 16814187.

It is not a de Polignac number, because 78141861 - 2³ = 78141853 is a prime.

It is a super-2 number, since 2×78141861² = 12212300881086642, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78141881) 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, 121206 + ... + 121848.

It is an arithmetic number, because the mean of its divisors is an integer number (5521240).

Almost surely, 2^78141861 is an apocalyptic number.

It is an amenable number.

78141861 is a deficient number, since it is larger than the sum of its proper divisors (54367899).

78141861 is an frugal number, since it uses more digits than its factorization.

78141861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1302 (or 653 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 78141861 is about 8839.7885155698. The cubic root of 78141861 is about 427.5247384884.

It can be divided in two parts, 7814186 and 1, that added together give a palindrome (7814187).

The spelling of 78141861 in words is "seventy-eight million, one hundred forty-one thousand, eight hundred sixty-one".