61612040 has 64 divisors (see below), whose sum is σ = 159183360. Its totient is φ = 21024000.

The previous prime is 61612039. The next prime is 61612081. The reversal of 61612040 is 4021616.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81665 + ... + 82415.

It is an arithmetic number, because the mean of its divisors is an integer number (2487240).

Almost surely, 2^61612040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61612040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79591680).

61612040 is an abundant number, since it is smaller than the sum of its proper divisors (97571320).

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

61612040 is a wasteful number, since it uses less digits than its factorization.

61612040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1062 (or 1058 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 61612040 is about 7849.3337296869. Note that the first 3 decimals coincide. The cubic root of 61612040 is about 394.9618934558.

Adding to 61612040 its reverse (4021616), we get a palindrome (65633656).

The spelling of 61612040 in words is "sixty-one million, six hundred twelve thousand, forty".