6557730 has 16 divisors (see below), whose sum is σ = 15738624. Its totient is φ = 1748720.

The previous prime is 6557723. The next prime is 6557731. The reversal of 6557730 is 377556.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6557691 and 6557700.

It is not an unprimeable number, because it can be changed into a prime (6557731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109266 + ... + 109325.

It is an arithmetic number, because the mean of its divisors is an integer number (983664).

Almost surely, 2^6557730 is an apocalyptic number.

6557730 is an abundant number, since it is smaller than the sum of its proper divisors (9180894).

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

6557730 is a wasteful number, since it uses less digits than its factorization.

6557730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218601.

The product of its (nonzero) digits is 22050, while the sum is 33.

The square root of 6557730 is about 2560.8065135812. The cubic root of 6557730 is about 187.1764375158.

It can be divided in two parts, 655 and 7730, that added together give a triangular number (8385 = T₁₂₉).

The spelling of 6557730 in words is "six million, five hundred fifty-seven thousand, seven hundred thirty".