78140511 has 16 divisors (see below), whose sum is σ = 116269920. Its totient is φ = 51865920.

The previous prime is 78140509. The next prime is 78140533. The reversal of 78140511 is 11504187.

78140511 is a `hidden beast` number, since 7 + 8 + 140 + 511 = 666.

It is not a de Polignac number, because 78140511 - 2¹ = 78140509 is a prime.

It is a super-2 number, since 2×78140511² = 12211878918682242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78150511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81 + ... + 12501.

It is an arithmetic number, because the mean of its divisors is an integer number (7266870).

Almost surely, 2^78140511 is an apocalyptic number.

78140511 is a deficient number, since it is larger than the sum of its proper divisors (38129409).

78140511 is a wasteful number, since it uses less digits than its factorization.

78140511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12663 (or 12657 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 78140511 is about 8839.7121559472. The cubic root of 78140511 is about 427.5222764631.

Adding to 78140511 its reverse (11504187), we get a palindrome (89644698).

The spelling of 78140511 in words is "seventy-eight million, one hundred forty thousand, five hundred eleven".