78377600387 has 4 divisors (see below), whose sum is σ = 78508448400. Its totient is φ = 78246752376.

The previous prime is 78377600369. The next prime is 78377600417. The reversal of 78377600387 is 78300677387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78300677387 = 73 ⋅1072612019.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78377600387 is a prime.

It is a super-2 number, since 2×78377600387² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78377600087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65423108 + ... + 65424305.

It is an arithmetic number, because the mean of its divisors is an integer number (19627112100).

Almost surely, 2^78377600387 is an apocalyptic number.

78377600387 is a deficient number, since it is larger than the sum of its proper divisors (130848013).

78377600387 is a wasteful number, since it uses less digits than its factorization.

78377600387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130848012.

The product of its (nonzero) digits is 8297856, while the sum is 56.

The spelling of 78377600387 in words is "seventy-eight billion, three hundred seventy-seven million, six hundred thousand, three hundred eighty-seven".