261099300 has 288 divisors, whose sum is σ = 959938560. Its totient is φ = 53222400.

The previous prime is 261099283. The next prime is 261099301. The reversal of 261099300 is 3990162.

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

It is not an unprimeable number, because it can be changed into a prime (261099301) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2055837 + ... + 2055963.

It is an arithmetic number, because the mean of its divisors is an integer number (3333120).

Almost surely, 2^261099300 is an apocalyptic number.

261099300 is a gapful number since it is divisible by the number (20) 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 261099300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (479969280).

261099300 is an abundant number, since it is smaller than the sum of its proper divisors (698839260).

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

261099300 is a wasteful number, since it uses less digits than its factorization.

261099300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 261099300 is about 16158.5673869932. The cubic root of 261099300 is about 639.1486890746.

The spelling of 261099300 in words is "two hundred sixty-one million, ninety-nine thousand, three hundred".