6440970678 has 16 divisors (see below), whose sum is σ = 12893147136. Its totient is φ = 2145122600.

The previous prime is 6440970677. The next prime is 6440970689. The reversal of 6440970678 is 8760790446.

It is a super-2 number, since 2×6440970678² = 82972206549711559368, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6440970678.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440970677) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 459426 + ... + 473237.

It is an arithmetic number, because the mean of its divisors is an integer number (805821696).

Almost surely, 2^6440970678 is an apocalyptic number.

6440970678 is an abundant number, since it is smaller than the sum of its proper divisors (6452176458).

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

6440970678 is a wasteful number, since it uses less digits than its factorization.

6440970678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933819.

The product of its (nonzero) digits is 2032128, while the sum is 51.

The square root of 6440970678 is about 80255.6582304326. The cubic root of 6440970678 is about 1860.5889642552.

The spelling of 6440970678 in words is "six billion, four hundred forty million, nine hundred seventy thousand, six hundred seventy-eight".