261652620 has 48 divisors (see below), whose sum is σ = 739898208. Its totient is φ = 69081600.

The previous prime is 261652597. The next prime is 261652711. The reversal of 261652620 is 26256162.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15529 + ... + 27648.

It is an arithmetic number, because the mean of its divisors is an integer number (15414546).

Almost surely, 2^261652620 is an apocalyptic number.

261652620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261652620 is an abundant number, since it is smaller than the sum of its proper divisors (478245588).

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

261652620 is a wasteful number, since it uses less digits than its factorization.

261652620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43290 (or 43288 counting only the distinct ones).

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

The square root of 261652620 is about 16175.6798929751. The cubic root of 261652620 is about 639.5998638142.

The spelling of 261652620 in words is "two hundred sixty-one million, six hundred fifty-two thousand, six hundred twenty".