6402620040 has 32 divisors (see below), whose sum is σ = 19207860480. Its totient is φ = 1707365312.

The previous prime is 6402619987. The next prime is 6402620041. The reversal of 6402620040 is 400262046.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (6402620041) 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, 26677464 + ... + 26677703.

It is an arithmetic number, because the mean of its divisors is an integer number (600245640).

Almost surely, 2^6402620040 is an apocalyptic number.

6402620040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6402620040 is an abundant number, since it is smaller than the sum of its proper divisors (12805240440).

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

6402620040 is a wasteful number, since it uses less digits than its factorization.

6402620040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53355181 (or 53355177 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 6402620040 is about 80016.3735744129. The cubic root of 6402620040 is about 1856.8888561382. Note that the first 4 decimals are identical.

Adding to 6402620040 its reverse (400262046), we get a palindrome (6802882086).

The spelling of 6402620040 in words is "six billion, four hundred two million, six hundred twenty thousand, forty".