261992248 has 32 divisors (see below), whose sum is σ = 565148160. Its totient is φ = 111535200.

The previous prime is 261992243. The next prime is 261992257. The reversal of 261992248 is 842299162.

It is a happy number.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261992243) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7036 + ... + 23947.

It is an arithmetic number, because the mean of its divisors is an integer number (17660880).

Almost surely, 2^261992248 is an apocalyptic number.

261992248 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

261992248 is an abundant number, since it is smaller than the sum of its proper divisors (303155912).

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

261992248 is a wasteful number, since it uses less digits than its factorization.

261992248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31147 (or 31143 counting only the distinct ones).

The product of its digits is 124416, while the sum is 43.

The square root of 261992248 is about 16186.1745943876. The cubic root of 261992248 is about 639.8764800685.

The spelling of 261992248 in words is "two hundred sixty-one million, nine hundred ninety-two thousand, two hundred forty-eight".