78977398 has 16 divisors (see below), whose sum is σ = 125274240. Its totient is φ = 37281600.

The previous prime is 78977383. The next prime is 78977399. The reversal of 78977398 is 89377987.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78977399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12993 + ... + 18076.

It is an arithmetic number, because the mean of its divisors is an integer number (7829640).

Almost surely, 2^78977398 is an apocalyptic number.

78977398 is a deficient number, since it is larger than the sum of its proper divisors (46296842).

78977398 is a wasteful number, since it uses less digits than its factorization.

78977398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31143.

The product of its digits is 5334336, while the sum is 58.

The square root of 78977398 is about 8886.9228645240. The cubic root of 78977398 is about 429.0431183036.

It can be divided in two parts, 789 and 77398, that added together give a palindrome (78187).

The spelling of 78977398 in words is "seventy-eight million, nine hundred seventy-seven thousand, three hundred ninety-eight".