6400630920 has 32 divisors (see below), whose sum is σ = 19201893120. Its totient is φ = 1706834880.

The previous prime is 6400630903. The next prime is 6400630933. The reversal of 6400630920 is 290360046.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26669176 + ... + 26669415.

It is an arithmetic number, because the mean of its divisors is an integer number (600059160).

Almost surely, 2^6400630920 is an apocalyptic number.

6400630920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6400630920 is an abundant number, since it is smaller than the sum of its proper divisors (12801262200).

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

6400630920 is a wasteful number, since it uses less digits than its factorization.

6400630920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53338605 (or 53338601 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The square root of 6400630920 is about 80003.9431528222. The cubic root of 6400630920 is about 1856.6965412576.

Adding to 6400630920 its reverse (290360046), we get a palindrome (6690990966).

The spelling of 6400630920 in words is "six billion, four hundred million, six hundred thirty thousand, nine hundred twenty".