6420401544 has 16 divisors (see below), whose sum is σ = 16051003920. Its totient is φ = 2140133840.

The previous prime is 6420401531. The next prime is 6420401557. The reversal of 6420401544 is 4451040246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6420401531) and next prime (6420401557).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133758342 + ... + 133758389.

It is an arithmetic number, because the mean of its divisors is an integer number (1003187745).

Almost surely, 2^6420401544 is an apocalyptic number.

It is an amenable number.

6420401544 is an abundant number, since it is smaller than the sum of its proper divisors (9630602376).

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

6420401544 is a wasteful number, since it uses less digits than its factorization.

6420401544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267516740 (or 267516736 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 30.

The square root of 6420401544 is about 80127.4081946995. The cubic root of 6420401544 is about 1858.6062654237.

The spelling of 6420401544 in words is "six billion, four hundred twenty million, four hundred one thousand, five hundred forty-four".