78254445287 has 4 divisors (see below), whose sum is σ = 80163090336. Its totient is φ = 76345800240.

The previous prime is 78254445281. The next prime is 78254445317.

78254445287 is nontrivially palindromic in base 10.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78254445287 is a prime.

It is a super-2 number, since 2×78254445287² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78254445281) 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, 954322463 + ... + 954322544.

It is an arithmetic number, because the mean of its divisors is an integer number (20040772584).

Almost surely, 2^78254445287 is an apocalyptic number.

78254445287 is a deficient number, since it is larger than the sum of its proper divisors (1908645049).

78254445287 is a wasteful number, since it uses less digits than its factorization.

78254445287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1908645048.

The product of its digits is 20070400, while the sum is 56.

The spelling of 78254445287 in words is "seventy-eight billion, two hundred fifty-four million, four hundred forty-five thousand, two hundred eighty-seven".