678872390 has 64 divisors (see below), whose sum is σ = 1513188864. Its totient is φ = 213954048.

The previous prime is 678872387. The next prime is 678872399. The reversal of 678872390 is 93278876.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678872399) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44537 + ... + 57803.

It is an arithmetic number, because the mean of its divisors is an integer number (23643576).

Almost surely, 2^678872390 is an apocalyptic number.

678872390 is an abundant number, since it is smaller than the sum of its proper divisors (834316474).

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

678872390 is a wasteful number, since it uses less digits than its factorization.

678872390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13341.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 678872390 is about 26055.1797153656. The cubic root of 678872390 is about 878.8795959887.

The spelling of 678872390 in words is "six hundred seventy-eight million, eight hundred seventy-two thousand, three hundred ninety".