78000511 has 4 divisors (see below), whose sum is σ = 78018552. Its totient is φ = 77982472.

The previous prime is 78000499. The next prime is 78000541. The reversal of 78000511 is 11500087.

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 78000511 - 2¹¹ = 77998463 is a prime.

It is a super-2 number, since 2×78000511² = 12168159432522242, which 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 (78000541) 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, 1761 + ... + 12613.

It is an arithmetic number, because the mean of its divisors is an integer number (19504638).

Almost surely, 2^78000511 is an apocalyptic number.

78000511 is a deficient number, since it is larger than the sum of its proper divisors (18041).

78000511 is a wasteful number, since it uses less digits than its factorization.

78000511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18040.

The product of its (nonzero) digits is 280, while the sum is 22.

The square root of 78000511 is about 8831.7897959587. The cubic root of 78000511 is about 427.2668012142.

Adding to 78000511 its reverse (11500087), we get a palindrome (89500598).

The spelling of 78000511 in words is "seventy-eight million, five hundred eleven", and thus it is an aban number.