261601692 has 96 divisors (see below), whose sum is σ = 707857920. Its totient is φ = 74430720.

The previous prime is 261601687. The next prime is 261601699. The reversal of 261601692 is 296106162.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261601699) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 140713 + ... + 142559.

It is an arithmetic number, because the mean of its divisors is an integer number (7373520).

Almost surely, 2^261601692 is an apocalyptic number.

261601692 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 261601692, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353928960).

261601692 is an abundant number, since it is smaller than the sum of its proper divisors (446256228).

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

261601692 is a wasteful number, since it uses less digits than its factorization.

261601692 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1931 (or 1929 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 261601692 is about 16174.1056012380. The cubic root of 261601692 is about 639.5583639361.

The spelling of 261601692 in words is "two hundred sixty-one million, six hundred one thousand, six hundred ninety-two".