261954620 has 48 divisors (see below), whose sum is σ = 562772448. Its totient is φ = 102385920.

The previous prime is 261954607. The next prime is 261954661. The reversal of 261954620 is 26459162.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 445967 + ... + 446553.

It is an arithmetic number, because the mean of its divisors is an integer number (11724426).

Almost surely, 2^261954620 is an apocalyptic number.

261954620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261954620 is an abundant number, since it is smaller than the sum of its proper divisors (300817828).

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

261954620 is a wasteful number, since it uses less digits than its factorization.

261954620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070 (or 1068 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 261954620 is about 16185.0122026522. The cubic root of 261954620 is about 639.8458450336.

The spelling of 261954620 in words is "two hundred sixty-one million, nine hundred fifty-four thousand, six hundred twenty".