78328407587 has 4 divisors (see below), whose sum is σ = 78329019720. Its totient is φ = 78327795456.

The previous prime is 78328407571. The next prime is 78328407601. The reversal of 78328407587 is 78570482387.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 78570482387 = 37 ⋅2123526551.

It is a cyclic number.

It is not a de Polignac number, because 78328407587 - 2⁴ = 78328407571 is a prime.

It is a super-2 number, since 2×78328407587² (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 (78328407527) 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, 32798 + ... + 397155.

It is an arithmetic number, because the mean of its divisors is an integer number (19582254930).

Almost surely, 2^78328407587 is an apocalyptic number.

78328407587 is a deficient number, since it is larger than the sum of its proper divisors (612133).

78328407587 is a wasteful number, since it uses less digits than its factorization.

78328407587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612132.

The product of its (nonzero) digits is 21073920, while the sum is 59.

The spelling of 78328407587 in words is "seventy-eight billion, three hundred twenty-eight million, four hundred seven thousand, five hundred eighty-seven".