261948654 has 56 divisors (see below), whose sum is σ = 642710232. Its totient is φ = 79373520.

The previous prime is 261948629. The next prime is 261948683. The reversal of 261948654 is 456849162.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 7872 + ... + 24204.

Almost surely, 2^261948654 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261948654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (321355116).

261948654 is an abundant number, since it is smaller than the sum of its proper divisors (380761578).

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

261948654 is a wasteful number, since it uses less digits than its factorization.

261948654 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16364 (or 16349 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 261948654 is about 16184.8278952851. The cubic root of 261948654 is about 639.8409875137.

The spelling of 261948654 in words is "two hundred sixty-one million, nine hundred forty-eight thousand, six hundred fifty-four".