78652890 has 64 divisors (see below), whose sum is σ = 216529920. Its totient is φ = 20295360.

The previous prime is 78652867. The next prime is 78652909. The reversal of 78652890 is 9825687.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon 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, 3672 + ... + 13068.

It is an arithmetic number, because the mean of its divisors is an integer number (3383280).

Almost surely, 2^78652890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78652890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108264960).

78652890 is an abundant number, since it is smaller than the sum of its proper divisors (137877030).

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

78652890 is a wasteful number, since it uses less digits than its factorization.

78652890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9444 (or 9438 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 78652890 is about 8868.6464581694. The cubic root of 78652890 is about 428.4546839154.

The spelling of 78652890 in words is "seventy-eight million, six hundred fifty-two thousand, eight hundred ninety".