6520723272 has 144 divisors (see below), whose sum is σ = 20856813120. Its totient is φ = 1802831040.

The previous prime is 6520723243. The next prime is 6520723277. The reversal of 6520723272 is 2723270256.

It is a super-4 number, since 4×6520723272⁴ (a number of 40 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (6520723277) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 477613 + ... + 491075.

It is an arithmetic number, because the mean of its divisors is an integer number (144838980).

Almost surely, 2^6520723272 is an apocalyptic number.

6520723272 is a gapful number since it is divisible by the number (62) 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 6520723272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10428406560).

6520723272 is an abundant number, since it is smaller than the sum of its proper divisors (14336089848).

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

6520723272 is a wasteful number, since it uses less digits than its factorization.

6520723272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13544 (or 13506 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 6520723272 is about 80750.9954861239. The cubic root of 6520723272 is about 1868.2368037186.

The spelling of 6520723272 in words is "six billion, five hundred twenty million, seven hundred twenty-three thousand, two hundred seventy-two".