78829644 has 12 divisors (see below), whose sum is σ = 183935864. Its totient is φ = 26276544.

The previous prime is 78829633. The next prime is 78829649. The reversal of 78829644 is 44692887.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78829644² = 12428225546333472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78829593 and 78829602.

It is not an unprimeable number, because it can be changed into a prime (78829649) 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, 3284557 + ... + 3284580.

Almost surely, 2^78829644 is an apocalyptic number.

It is an amenable number.

78829644 is an abundant number, since it is smaller than the sum of its proper divisors (105106220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78829644 is a wasteful number, since it uses less digits than its factorization.

78829644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6569144 (or 6569142 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 78829644 is about 8878.6059716602. The cubic root of 78829644 is about 428.7753944052.

The spelling of 78829644 in words is "seventy-eight million, eight hundred twenty-nine thousand, six hundred forty-four".