78399414 has 40 divisors (see below), whose sum is σ = 176810040. Its totient is φ = 25964064.

The previous prime is 78399401. The next prime is 78399437. The reversal of 78399414 is 41499387.

It is a super-2 number, since 2×78399414² = 12292936231086792, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78399414.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 24922 + ... + 27890.

It is an arithmetic number, because the mean of its divisors is an integer number (4420251).

Almost surely, 2^78399414 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78399414, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88405020).

78399414 is an abundant number, since it is smaller than the sum of its proper divisors (98410626).

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

78399414 is a wasteful number, since it uses less digits than its factorization.

78399414 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3146 (or 3137 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 78399414 is about 8854.3443574327. The cubic root of 78399414 is about 427.9939258753.

The spelling of 78399414 in words is "seventy-eight million, three hundred ninety-nine thousand, four hundred fourteen".