78220349 has 8 divisors (see below), whose sum is σ = 83871360. Its totient is φ = 72686016.

The previous prime is 78220343. The next prime is 78220357. The reversal of 78220349 is 94302287.

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

It is a de Polignac number, because none of the positive numbers 2^k-78220349 is a prime.

It is a super-2 number, since 2×78220349² = 12236845995363602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78220343) 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, 27779 + ... + 30464.

It is an arithmetic number, because the mean of its divisors is an integer number (10483920).

Almost surely, 2^78220349 is an apocalyptic number.

78220349 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

78220349 is a deficient number, since it is larger than the sum of its proper divisors (5651011).

78220349 is a wasteful number, since it uses less digits than its factorization.

78220349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58339.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 78220349 is about 8844.2268740688. The cubic root of 78220349 is about 427.6678300946.

The spelling of 78220349 in words is "seventy-eight million, two hundred twenty thousand, three hundred forty-nine".