78268641 has 16 divisors (see below), whose sum is σ = 114444480. Its totient is φ = 47185920.

The previous prime is 78268639. The next prime is 78268667. The reversal of 78268641 is 14686287.

It is not a de Polignac number, because 78268641 - 2¹ = 78268639 is a prime.

It is a super-2 number, since 2×78268641² = 12251960327973762, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78268593 and 78268602.

It is not an unprimeable number, because it can be changed into a prime (78268601) 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 15 ways as a sum of consecutive naturals, for example, 225 + ... + 12513.

It is an arithmetic number, because the mean of its divisors is an integer number (7152780).

Almost surely, 2^78268641 is an apocalyptic number.

It is an amenable number.

78268641 is a deficient number, since it is larger than the sum of its proper divisors (36175839).

78268641 is a wasteful number, since it uses less digits than its factorization.

78268641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12496.

The product of its digits is 129024, while the sum is 42.

The square root of 78268641 is about 8846.9565953496. The cubic root of 78268641 is about 427.7558237617.

The spelling of 78268641 in words is "seventy-eight million, two hundred sixty-eight thousand, six hundred forty-one".