78961687 has 10 divisors (see below), whose sum is σ = 92119288. Its totient is φ = 67679388.

The previous prime is 78961669. The next prime is 78961697. The reversal of 78961687 is 78616987.

It is not a de Polignac number, because 78961687 - 2⁷ = 78961559 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78961607) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 14043 + ... + 18844.

Almost surely, 2^78961687 is an apocalyptic number.

78961687 is a deficient number, since it is larger than the sum of its proper divisors (13157601).

78961687 is an frugal number, since it uses more digits than its factorization.

78961687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32915 (or 32894 counting only the distinct ones).

The product of its digits is 1016064, while the sum is 52.

The square root of 78961687 is about 8886.0388813014. The cubic root of 78961687 is about 429.0146665202.

The spelling of 78961687 in words is "seventy-eight million, nine hundred sixty-one thousand, six hundred eighty-seven".