78610511 has 4 divisors (see below), whose sum is σ = 89840592. Its totient is φ = 67380432.

The previous prime is 78610487. The next prime is 78610523. The reversal of 78610511 is 11501687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11501687 = 2081 ⋅5527.

It is not a de Polignac number, because 78610511 - 2⁶ = 78610447 is a prime.

It is a super-2 number, since 2×78610511² = 12359224879362242, 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 (78610531) 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 3 ways as a sum of consecutive naturals, for example, 5615030 + ... + 5615043.

It is an arithmetic number, because the mean of its divisors is an integer number (22460148).

Almost surely, 2^78610511 is an apocalyptic number.

78610511 is a deficient number, since it is larger than the sum of its proper divisors (11230081).

78610511 is a wasteful number, since it uses less digits than its factorization.

78610511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230080.

The product of its (nonzero) digits is 1680, while the sum is 29.

The square root of 78610511 is about 8866.2568764953. The cubic root of 78610511 is about 428.3777181351.

The spelling of 78610511 in words is "seventy-eight million, six hundred ten thousand, five hundred eleven".