61560840 has 128 divisors (see below), whose sum is σ = 203472000. Its totient is φ = 14776320.

The previous prime is 61560833. The next prime is 61560841. The reversal of 61560840 is 4806516.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 61560798 and 61560807.

It is not an unprimeable number, because it can be changed into a prime (61560841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 196524 + ... + 196836.

It is an arithmetic number, because the mean of its divisors is an integer number (1589625).

Almost surely, 2^61560840 is an apocalyptic number.

61560840 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 61560840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101736000).

61560840 is an abundant number, since it is smaller than the sum of its proper divisors (141911160).

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

61560840 is a wasteful number, since it uses less digits than its factorization.

61560840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487 (or 483 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 61560840 is about 7846.0716285285. The cubic root of 61560840 is about 394.8524578482.

The spelling of 61560840 in words is "sixty-one million, five hundred sixty thousand, eight hundred forty".