78244669 has 4 divisors (see below), whose sum is σ = 78962620. Its totient is φ = 77526720.

The previous prime is 78244667. The next prime is 78244721. The reversal of 78244669 is 96644287.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51308569 + 26936100 = 7163^2 + 5190^2 .

It is a cyclic number.

It is not a de Polignac number, because 78244669 - 2¹ = 78244667 is a prime.

It is a super-3 number, since 3×78244669³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78244667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358812 + ... + 359029.

It is an arithmetic number, because the mean of its divisors is an integer number (19740655).

Almost surely, 2^78244669 is an apocalyptic number.

It is an amenable number.

78244669 is a deficient number, since it is larger than the sum of its proper divisors (717951).

78244669 is a wasteful number, since it uses less digits than its factorization.

78244669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717950.

The product of its digits is 580608, while the sum is 46.

The square root of 78244669 is about 8845.6016754091. The cubic root of 78244669 is about 427.7121485020.

It can be divided in two parts, 782 and 44669, that added together give a triangular number (45451 = T₃₀₁).

The spelling of 78244669 in words is "seventy-eight million, two hundred forty-four thousand, six hundred sixty-nine".