261526620 has 24 divisors (see below), whose sum is σ = 732274704. Its totient is φ = 69740416.

The previous prime is 261526607. The next prime is 261526631. The reversal of 261526620 is 26625162.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2179329 + ... + 2179448.

It is an arithmetic number, because the mean of its divisors is an integer number (30511446).

Almost surely, 2^261526620 is an apocalyptic number.

261526620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261526620 is an abundant number, since it is smaller than the sum of its proper divisors (470748084).

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

261526620 is a wasteful number, since it uses less digits than its factorization.

261526620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4358789 (or 4358787 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 261526620 is about 16171.7846881536. The cubic root of 261526620 is about 639.4971799295.

The spelling of 261526620 in words is "two hundred sixty-one million, five hundred twenty-six thousand, six hundred twenty".