261058380 has 48 divisors (see below), whose sum is σ = 797416704. Its totient is φ = 63286720.

The previous prime is 261058367. The next prime is 261058381. The reversal of 261058380 is 83850162.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (261058381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197112 + ... + 198431.

It is an arithmetic number, because the mean of its divisors is an integer number (16612848).

Almost surely, 2^261058380 is an apocalyptic number.

261058380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

261058380 is an abundant number, since it is smaller than the sum of its proper divisors (536358324).

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

261058380 is a wasteful number, since it uses less digits than its factorization.

261058380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395566 (or 395564 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 261058380 is about 16157.3011360190. The cubic root of 261058380 is about 639.1152977802.

The spelling of 261058380 in words is "two hundred sixty-one million, fifty-eight thousand, three hundred eighty".