78871945 has 16 divisors (see below), whose sum is σ = 103962240. Its totient is φ = 57176064.

The previous prime is 78871943. The next prime is 78871957. The reversal of 78871945 is 54917887.

It is a cyclic number.

It is not a de Polignac number, because 78871945 - 2¹ = 78871943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78871943) 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, 15864 + ... + 20233.

It is an arithmetic number, because the mean of its divisors is an integer number (6497640).

Almost surely, 2^78871945 is an apocalyptic number.

It is an amenable number.

78871945 is a deficient number, since it is larger than the sum of its proper divisors (25090295).

78871945 is a wasteful number, since it uses less digits than its factorization.

78871945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36144.

The product of its digits is 564480, while the sum is 49.

The square root of 78871945 is about 8880.9878391990. The cubic root of 78871945 is about 428.8520761529.

The spelling of 78871945 in words is "seventy-eight million, eight hundred seventy-one thousand, nine hundred forty-five".