78367500389 has 4 divisors (see below), whose sum is σ = 78368814924. Its totient is φ = 78366185856.

The previous prime is 78367500383. The next prime is 78367500433. The reversal of 78367500389 is 98300576387.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30325436164 + 48042064225 = 174142^2 + 219185^2 .

It is a cyclic number.

It is not a de Polignac number, because 78367500389 - 2¹² = 78367496293 is a prime.

It is a super-2 number, since 2×78367500389² (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 (78367500383) 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, 563372 + ... + 688565.

It is an arithmetic number, because the mean of its divisors is an integer number (19592203731).

Almost surely, 2^78367500389 is an apocalyptic number.

It is an amenable number.

78367500389 is a deficient number, since it is larger than the sum of its proper divisors (1314535).

78367500389 is a wasteful number, since it uses less digits than its factorization.

78367500389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314534.

The product of its (nonzero) digits is 7620480, while the sum is 56.

The spelling of 78367500389 in words is "seventy-eight billion, three hundred sixty-seven million, five hundred thousand, three hundred eighty-nine".