78873961 has 4 divisors (see below), whose sum is σ = 78909012. Its totient is φ = 78838912.

The previous prime is 78873953. The next prime is 78873979. The reversal of 78873961 is 16937887.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 68376361 + 10497600 = 8269^2 + 3240^2 .

It is a cyclic number.

It is not a de Polignac number, because 78873961 - 2³ = 78873953 is a prime.

It is a super-2 number, since 2×78873961² = 12442203447659042, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (78879961) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 13900 + ... + 18733.

It is an arithmetic number, because the mean of its divisors is an integer number (19727253).

Almost surely, 2^78873961 is an apocalyptic number.

It is an amenable number.

78873961 is a deficient number, since it is larger than the sum of its proper divisors (35051).

78873961 is a wasteful number, since it uses less digits than its factorization.

78873961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35050.

The product of its digits is 508032, while the sum is 49.

The square root of 78873961 is about 8881.1013393610. The cubic root of 78873961 is about 428.8557300015.

The spelling of 78873961 in words is "seventy-eight million, eight hundred seventy-three thousand, nine hundred sixty-one".