6561764 has 48 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 2748960.

The previous prime is 6561761. The next prime is 6561767. The reversal of 6561764 is 4671656.

6561764 = T₂₄₇ + T₂₄₈ + ... + T₃₇₈.

It is an interprime number because it is at equal distance from previous prime (6561761) and next prime (6561767).

It is not an unprimeable number, because it can be changed into a prime (6561761) 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, 39209 + ... + 39375.

It is an arithmetic number, because the mean of its divisors is an integer number (282240).

Almost surely, 2^6561764 is an apocalyptic number.

It is an amenable number.

6561764 is an abundant number, since it is smaller than the sum of its proper divisors (6985756).

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

6561764 is a wasteful number, since it uses less digits than its factorization.

6561764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 246 counting only the distinct ones).

The product of its digits is 30240, while the sum is 35.

The square root of 6561764 is about 2561.5940349712. The cubic root of 6561764 is about 187.2148102949.

The spelling of 6561764 in words is "six million, five hundred sixty-one thousand, seven hundred sixty-four".