78351015387 has 4 divisors (see below), whose sum is σ = 104468020520. Its totient is φ = 52234010256.

The previous prime is 78351015377. The next prime is 78351015389.

78351015387 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 78351015387 - 2¹⁰ = 78351014363 is a prime.

It is a super-2 number, since 2×78351015387² (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 (78351015389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13058502562 + ... + 13058502567.

It is an arithmetic number, because the mean of its divisors is an integer number (26117005130).

Almost surely, 2^78351015387 is an apocalyptic number.

78351015387 is a deficient number, since it is larger than the sum of its proper divisors (26117005133).

78351015387 is a wasteful number, since it uses less digits than its factorization.

78351015387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26117005132.

The product of its (nonzero) digits is 705600, while the sum is 48.

It can be divided in two parts, 783510 and 15387, that added together give a palindrome (798897).

The spelling of 78351015387 in words is "seventy-eight billion, three hundred fifty-one million, fifteen thousand, three hundred eighty-seven".