61224210 has 72 divisors (see below), whose sum is σ = 162702540. Its totient is φ = 15971904.

The previous prime is 61224199. The next prime is 61224211. The reversal of 61224210 is 1242216.

61224210 is a `hidden beast` number, since 612 + 2 + 42 + 10 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61168041 + 56169 = 7821^2 + 237^2 .

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 (61224211) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 561636 + ... + 561744.

Almost surely, 2^61224210 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61224210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81351270).

61224210 is an abundant number, since it is smaller than the sum of its proper divisors (101478330).

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

61224210 is a wasteful number, since it uses less digits than its factorization.

61224210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 198 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 61224210 is about 7824.5900851099. The cubic root of 61224210 is about 394.1314248019.

Adding to 61224210 its reverse (1242216), we get a palindrome (62466426).

The spelling of 61224210 in words is "sixty-one million, two hundred twenty-four thousand, two hundred ten".