261624620 has 12 divisors (see below), whose sum is σ = 549411744. Its totient is φ = 104649840.

The previous prime is 261624553. The next prime is 261624637. The reversal of 261624620 is 26426162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6540596 + ... + 6540635.

It is an arithmetic number, because the mean of its divisors is an integer number (45784312).

Almost surely, 2^261624620 is an apocalyptic number.

261624620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261624620 is an abundant number, since it is smaller than the sum of its proper divisors (287787124).

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

261624620 is a wasteful number, since it uses less digits than its factorization.

261624620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13081240 (or 13081238 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 261624620 is about 16174.8143729689. The cubic root of 261624620 is about 639.5770480224.

The spelling of 261624620 in words is "two hundred sixty-one million, six hundred twenty-four thousand, six hundred twenty".