61260640 has 96 divisors (see below), whose sum is σ = 167650560. Its totient is φ = 20719104.

The previous prime is 61260637. The next prime is 61260643. The reversal of 61260640 is 4606216.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (61260637) and next prime (61260643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61260643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 92631 + ... + 93289.

It is an arithmetic number, because the mean of its divisors is an integer number (1746360).

Almost surely, 2^61260640 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 61260640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83825280).

61260640 is an abundant number, since it is smaller than the sum of its proper divisors (106389920).

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

61260640 is a wasteful number, since it uses less digits than its factorization.

61260640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 764 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 61260640 is about 7826.9176563958. The cubic root of 61260640 is about 394.2095821241.

Adding to 61260640 its reverse (4606216), we get a palindrome (65866856).

The spelling of 61260640 in words is "sixty-one million, two hundred sixty thousand, six hundred forty".