6469139520 has 560 divisors, whose sum is σ = 24288219648. Its totient is φ = 1632337920.

The previous prime is 6469139491. The next prime is 6469139539. The reversal of 6469139520 is 259319646.

6469139520 is a `hidden beast` number, since 6 + 4 + 6 + 91 + 39 + 520 = 666.

It is a super-2 number, since 2×6469139520² = 83699532258451660800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 66692112 + ... + 66692208.

Almost surely, 2^6469139520 is an apocalyptic number.

6469139520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6469139520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12144109824).

6469139520 is an abundant number, since it is smaller than the sum of its proper divisors (17819080128).

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

6469139520 is a wasteful number, since it uses less digits than its factorization.

6469139520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 6469139520 is about 80430.9612027607. The cubic root of 6469139520 is about 1863.2973768178.

The spelling of 6469139520 in words is "six billion, four hundred sixty-nine million, one hundred thirty-nine thousand, five hundred twenty".