61224240 has 160 divisors (see below), whose sum is σ = 236699136. Its totient is φ = 12718080.

The previous prime is 61224239. The next prime is 61224253. The reversal of 61224240 is 4242216.

It is a super-4 number, since 4×61224240⁴ (a number of 32 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 16824 + ... + 20136.

Almost surely, 2^61224240 is an apocalyptic number.

61224240 is a gapful number since it is divisible by the number (60) 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 61224240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118349568).

61224240 is an abundant number, since it is smaller than the sum of its proper divisors (175474896).

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

61224240 is a wasteful number, since it uses less digits than its factorization.

61224240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3347 (or 3341 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 61224240 is about 7824.5920021430. The cubic root of 61224240 is about 394.1314891770.

Adding to 61224240 its reverse (4242216), we get a palindrome (65466456).

The spelling of 61224240 in words is "sixty-one million, two hundred twenty-four thousand, two hundred forty".