77898380 has 48 divisors (see below), whose sum is σ = 188348160. Its totient is φ = 26509248.

The previous prime is 77898367. The next prime is 77898389. The reversal of 77898380 is 8389877.

It is not an unprimeable number, because it can be changed into a prime (77898389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17459 + ... + 21461.

It is an arithmetic number, because the mean of its divisors is an integer number (3923920).

Almost surely, 2^77898380 is an apocalyptic number.

77898380 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77898380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94174080).

77898380 is an abundant number, since it is smaller than the sum of its proper divisors (110449780).

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

77898380 is a wasteful number, since it uses less digits than its factorization.

77898380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4158 (or 4156 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 77898380 is about 8826.0058916817. The cubic root of 77898380 is about 427.0802372860.

The spelling of 77898380 in words is "seventy-seven million, eight hundred ninety-eight thousand, three hundred eighty".