78013887 has 32 divisors (see below), whose sum is σ = 123432960. Its totient is φ = 42888960.

The previous prime is 78013853. The next prime is 78013891. The reversal of 78013887 is 78831087.

It is not a de Polignac number, because 78013887 - 2¹¹ = 78011839 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78013847) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 190539 + ... + 190947.

It is an arithmetic number, because the mean of its divisors is an integer number (3857280).

Almost surely, 2^78013887 is an apocalyptic number.

78013887 is a deficient number, since it is larger than the sum of its proper divisors (45419073).

78013887 is a wasteful number, since it uses less digits than its factorization.

78013887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 75264, while the sum is 42.

The square root of 78013887 is about 8832.5470278963. The cubic root of 78013887 is about 427.2912232511.

The spelling of 78013887 in words is "seventy-eight million, thirteen thousand, eight hundred eighty-seven".