78421012487 has 4 divisors (see below), whose sum is σ = 78422370696. Its totient is φ = 78419654280.

The previous prime is 78421012469. The next prime is 78421012517.

78421012487 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 not a de Polignac number, because 78421012487 - 2³⁶ = 9701535751 is a prime.

It is a super-2 number, since 2×78421012487² (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 (78421012457) 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, 588464 + ... + 709317.

It is an arithmetic number, because the mean of its divisors is an integer number (19605592674).

Almost surely, 2^78421012487 is an apocalyptic number.

78421012487 is a deficient number, since it is larger than the sum of its proper divisors (1358209).

78421012487 is a wasteful number, since it uses less digits than its factorization.

78421012487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1358208.

The product of its (nonzero) digits is 200704, while the sum is 44.

It can be divided in two parts, 784210 and 12487, that added together give a palindrome (796697).

The spelling of 78421012487 in words is "seventy-eight billion, four hundred twenty-one million, twelve thousand, four hundred eighty-seven".