7678398 has 80 divisors (see below), whose sum is σ = 19763856. Its totient is φ = 1975680.

The previous prime is 7678397. The next prime is 7678403. The reversal of 7678398 is 8938767.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7678397) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 187258 + ... + 187298.

Almost surely, 2^7678398 is an apocalyptic number.

7678398 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7678398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9881928).

7678398 is an abundant number, since it is smaller than the sum of its proper divisors (12085458).

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

7678398 is a wasteful number, since it uses less digits than its factorization.

7678398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 66 counting only the distinct ones).

The product of its digits is 508032, while the sum is 48.

The square root of 7678398 is about 2770.9922410573. The cubic root of 7678398 is about 197.2832466878.

The spelling of 7678398 in words is "seven million, six hundred seventy-eight thousand, three hundred ninety-eight".