6403551240 has 64 divisors (see below), whose sum is σ = 19473840000. Its totient is φ = 1684219392.

The previous prime is 6403551227. The next prime is 6403551241. The reversal of 6403551240 is 421553046.

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

It is a junction number, because it is equal to n+sod(n) for n = 6403551198 and 6403551207.

It is not an unprimeable number, because it can be changed into a prime (6403551241) 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, 356740 + ... + 374259.

It is an arithmetic number, because the mean of its divisors is an integer number (304278750).

Almost surely, 2^6403551240 is an apocalyptic number.

6403551240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6403551240 is an abundant number, since it is smaller than the sum of its proper divisors (13070288760).

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

6403551240 is a wasteful number, since it uses less digits than its factorization.

6403551240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731086 (or 731082 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 6403551240 is about 80022.1921719219. The cubic root of 6403551240 is about 1856.9788740304.

The spelling of 6403551240 in words is "six billion, four hundred three million, five hundred fifty-one thousand, two hundred forty".