78649344 has 144 divisors (see below), whose sum is σ = 241473960. Its totient is φ = 24576000.

The previous prime is 78649339. The next prime is 78649367. The reversal of 78649344 is 44394687.

It is a tau number, because it is divible by the number of its divisors (144).

It is a self number, because there is not a number n which added to its sum of digits gives 78649344.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313219 + ... + 313469.

Almost surely, 2^78649344 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78649344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120736980).

78649344 is an abundant number, since it is smaller than the sum of its proper divisors (162824616).

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

78649344 is a wasteful number, since it uses less digits than its factorization.

78649344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296 (or 273 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 78649344 is about 8868.4465381486. The cubic root of 78649344 is about 428.4482449779.

The spelling of 78649344 in words is "seventy-eight million, six hundred forty-nine thousand, three hundred forty-four".