78798390 has 64 divisors (see below), whose sum is σ = 209198592. Its totient is φ = 18835200.

The previous prime is 78798371. The next prime is 78798407. The reversal of 78798390 is 9389787.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22455 + ... + 25725.

It is an arithmetic number, because the mean of its divisors is an integer number (3268728).

Almost surely, 2^78798390 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78798390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104599296).

78798390 is an abundant number, since it is smaller than the sum of its proper divisors (130400202).

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

78798390 is a wasteful number, since it uses less digits than its factorization.

78798390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365.

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

The square root of 78798390 is about 8876.8457235665. The cubic root of 78798390 is about 428.7187206425.

The spelling of 78798390 in words is "seventy-eight million, seven hundred ninety-eight thousand, three hundred ninety".