6499920 has 160 divisors (see below), whose sum is σ = 23784192. Its totient is φ = 1437696.

The previous prime is 6499903. The next prime is 6499939. The reversal of 6499920 is 299946.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 89004 + ... + 89076.

Almost surely, 2^6499920 is an apocalyptic number.

6499920 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 6499920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11892096).

6499920 is an abundant number, since it is smaller than the sum of its proper divisors (17284272).

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

6499920 is a wasteful number, since it uses less digits than its factorization.

6499920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 34992, while the sum is 39.

The square root of 6499920 is about 2549.4940674573. The cubic root of 6499920 is about 186.6247921944.

The spelling of 6499920 in words is "six million, four hundred ninety-nine thousand, nine hundred twenty".