61012440 has 96 divisors (see below), whose sum is σ = 205667280. Its totient is φ = 16267392.

The previous prime is 61012421. The next prime is 61012447. The reversal of 61012440 is 4421016.

61012440 is a `hidden beast` number, since 610 + 12 + 4 + 40 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61012447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6582 + ... + 12858.

Almost surely, 2^61012440 is an apocalyptic number.

61012440 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 61012440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102833640).

61012440 is an abundant number, since it is smaller than the sum of its proper divisors (144654840).

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

61012440 is a wasteful number, since it uses less digits than its factorization.

61012440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6303 (or 6287 counting only the distinct ones).

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

The square root of 61012440 is about 7811.0460247012. The cubic root of 61012440 is about 393.6764760678.

Adding to 61012440 its reverse (4421016), we get a palindrome (65433456).

The spelling of 61012440 in words is "sixty-one million, twelve thousand, four hundred forty".