78297408 has 112 divisors (see below), whose sum is σ = 263103360. Its totient is φ = 22367232.

The previous prime is 78297403. The next prime is 78297409. The reversal of 78297408 is 80479287.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×78297408² = 12260968199036928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78297403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8860 + ... + 15332.

Almost surely, 2^78297408 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 78297408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (131551680).

78297408 is an abundant number, since it is smaller than the sum of its proper divisors (184805952).

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

78297408 is a wasteful number, since it uses less digits than its factorization.

78297408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6501 (or 6485 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 78297408 is about 8848.5822593227. The cubic root of 78297408 is about 427.8082233961.

The spelling of 78297408 in words is "seventy-eight million, two hundred ninety-seven thousand, four hundred eight".