77898390 has 16 divisors (see below), whose sum is σ = 186956208. Its totient is φ = 20772896.

The previous prime is 77898389. The next prime is 77898409. The reversal of 77898390 is 9389877.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1298277 + ... + 1298336.

It is an arithmetic number, because the mean of its divisors is an integer number (11684763).

Almost surely, 2^77898390 is an apocalyptic number.

77898390 is an abundant number, since it is smaller than the sum of its proper divisors (109057818).

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

77898390 is a wasteful number, since it uses less digits than its factorization.

77898390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2596623.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 77898390 is about 8826.0064581893. The cubic root of 77898390 is about 427.0802555611.

The spelling of 77898390 in words is "seventy-seven million, eight hundred ninety-eight thousand, three hundred ninety".