78610513 has 4 divisors (see below), whose sum is σ = 81146368. Its totient is φ = 76074660.

The previous prime is 78610487. The next prime is 78610523. The reversal of 78610513 is 31501687.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78610513 - 2¹⁷ = 78479441 is a prime.

It is a super-2 number, since 2×78610513² = 12359225508246338, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 2535823 = 78610513 / (7 + 8 + 6 + 1 + 0 + 5 + 1 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78610523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1267881 + ... + 1267942.

It is an arithmetic number, because the mean of its divisors is an integer number (20286592).

Almost surely, 2^78610513 is an apocalyptic number.

It is an amenable number.

78610513 is a deficient number, since it is larger than the sum of its proper divisors (2535855).

78610513 is a wasteful number, since it uses less digits than its factorization.

78610513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2535854.

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 78610513 is about 8866.2569892825. The cubic root of 78610513 is about 428.3777217680.

The spelling of 78610513 in words is "seventy-eight million, six hundred ten thousand, five hundred thirteen".