261215010 has 64 divisors (see below), whose sum is σ = 796089600. Its totient is φ = 59705856.

The previous prime is 261214991. The next prime is 261215011. The reversal of 261215010 is 10512162.

261215010 is a `hidden beast` number, since 2 + 612 + 1 + 50 + 1 + 0 = 666.

261215010 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (261215011) 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, 67215 + ... + 70994.

It is an arithmetic number, because the mean of its divisors is an integer number (12438900).

Almost surely, 2^261215010 is an apocalyptic number.

261215010 is an abundant number, since it is smaller than the sum of its proper divisors (534874590).

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

261215010 is a wasteful number, since it uses less digits than its factorization.

261215010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138232 (or 138226 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

The square root of 261215010 is about 16162.1474439506. The cubic root of 261215010 is about 639.2430911821.

Adding to 261215010 its reverse (10512162), we get a palindrome (271727172).

The spelling of 261215010 in words is "two hundred sixty-one million, two hundred fifteen thousand, ten".