78871779 has 16 divisors (see below), whose sum is σ = 133539840. Its totient is φ = 45069480.

The previous prime is 78871763. The next prime is 78871787. The reversal of 78871779 is 97717887.

It is not a de Polignac number, because 78871779 - 2⁴ = 78871763 is a prime.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (78871729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 208467 + ... + 208844.

It is an arithmetic number, because the mean of its divisors is an integer number (8346240).

Almost surely, 2^78871779 is an apocalyptic number.

78871779 is a deficient number, since it is larger than the sum of its proper divisors (54668061).

78871779 is a wasteful number, since it uses less digits than its factorization.

78871779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417327 (or 417321 counting only the distinct ones).

The product of its digits is 1382976, while the sum is 54.

The square root of 78871779 is about 8880.9784933869. The cubic root of 78871779 is about 428.8517752876.

The spelling of 78871779 in words is "seventy-eight million, eight hundred seventy-one thousand, seven hundred seventy-nine".