78409244 has 12 divisors (see below), whose sum is σ = 137537568. Its totient is φ = 39112800.

The previous prime is 78409241. The next prime is 78409273. The reversal of 78409244 is 44290487.

It is a super-2 number, since 2×78409244² = 12296019089303072, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78409198 and 78409207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78409241) 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 3 ways as a sum of consecutive naturals, for example, 21017 + ... + 24464.

It is an arithmetic number, because the mean of its divisors is an integer number (11461464).

Almost surely, 2^78409244 is an apocalyptic number.

It is an amenable number.

78409244 is a deficient number, since it is larger than the sum of its proper divisors (59128324).

78409244 is a wasteful number, since it uses less digits than its factorization.

78409244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45916 (or 45914 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 78409244 is about 8854.8994347762. The cubic root of 78409244 is about 428.0118129328.

The spelling of 78409244 in words is "seventy-eight million, four hundred nine thousand, two hundred forty-four".