61187500 has 84 divisors (see below), whose sum is σ = 147654360. Its totient is φ = 22000000.

The previous prime is 61187479. The next prime is 61187501. The reversal of 61187500 is 578116.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (61187501) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 687456 + ... + 687544.

It is an arithmetic number, because the mean of its divisors is an integer number (1757790).

Almost surely, 2^61187500 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 61187500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73827180).

61187500 is an abundant number, since it is smaller than the sum of its proper divisors (86466860).

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

61187500 is an equidigital number, since it uses as much as digits as its factorization.

61187500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 61187500 is about 7822.2439235810. The cubic root of 61187500 is about 394.0526353963.

The spelling of 61187500 in words is "sixty-one million, one hundred eighty-seven thousand, five hundred".