78340749 has 8 divisors (see below), whose sum is σ = 104771232. Its totient is φ = 52068720.

The previous prime is 78340747. The next prime is 78340771. The reversal of 78340749 is 94704387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78340749 - 2¹ = 78340747 is a prime.

It is a super-2 number, since 2×78340749² = 12274545907762002, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78340749.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78340747) 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 7 ways as a sum of consecutive naturals, for example, 38454 + ... + 40439.

It is an arithmetic number, because the mean of its divisors is an integer number (13096404).

Almost surely, 2^78340749 is an apocalyptic number.

It is an amenable number.

78340749 is a deficient number, since it is larger than the sum of its proper divisors (26430483).

78340749 is a wasteful number, since it uses less digits than its factorization.

78340749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79227.

The product of its (nonzero) digits is 169344, while the sum is 42.

The square root of 78340749 is about 8851.0309568999. The cubic root of 78340749 is about 427.8871456173.

The spelling of 78340749 in words is "seventy-eight million, three hundred forty thousand, seven hundred forty-nine".