78638741 has 4 divisors (see below), whose sum is σ = 78695052. Its totient is φ = 78582432.

The previous prime is 78638737. The next prime is 78638743. The reversal of 78638741 is 14783687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14783687 = 23 ⋅642769.

It can be written as a sum of positive squares in 2 ways, for example, as 73444900 + 5193841 = 8570^2 + 2279^2 .

It is a cyclic number.

It is not a de Polignac number, because 78638741 - 2² = 78638737 is a prime.

It is a super-3 number, since 3×78638741³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78638692 and 78638701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78638743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26006 + ... + 28871.

It is an arithmetic number, because the mean of its divisors is an integer number (19673763).

Almost surely, 2^78638741 is an apocalyptic number.

It is an amenable number.

78638741 is a deficient number, since it is larger than the sum of its proper divisors (56311).

78638741 is a wasteful number, since it uses less digits than its factorization.

78638741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56310.

The product of its digits is 225792, while the sum is 44.

The square root of 78638741 is about 8867.8487244653. The cubic root of 78638741 is about 428.4289905647.

The spelling of 78638741 in words is "seventy-eight million, six hundred thirty-eight thousand, seven hundred forty-one".