340668978 has 32 divisors (see below), whose sum is σ = 738170496. Its totient is φ = 104189568.

The previous prime is 340668973. The next prime is 340668983. The reversal of 340668978 is 879866043.

It is an interprime number because it is at equal distance from previous prime (340668973) and next prime (340668983).

It is a self number, because there is not a number n which added to its sum of digits gives 340668978.

It is not an unprimeable number, because it can be changed into a prime (340668971) 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, 51 + ... + 26102.

It is an arithmetic number, because the mean of its divisors is an integer number (23067828).

Almost surely, 2^340668978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 340668978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (369085248).

340668978 is an abundant number, since it is smaller than the sum of its proper divisors (397501518).

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

340668978 is a wasteful number, since it uses less digits than its factorization.

340668978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26338.

The product of its (nonzero) digits is 1741824, while the sum is 51.

The square root of 340668978 is about 18457.2202132390. The cubic root of 340668978 is about 698.4106649280.

The spelling of 340668978 in words is "three hundred forty million, six hundred sixty-eight thousand, nine hundred seventy-eight".