61506500 has 96 divisors (see below), whose sum is σ = 150014592. Its totient is φ = 21840000.

The previous prime is 61506479. The next prime is 61506509. The reversal of 61506500 is 560516.

It is not an unprimeable number, because it can be changed into a prime (61506509) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 291395 + ... + 291605.

It is an arithmetic number, because the mean of its divisors is an integer number (1562652).

Almost surely, 2^61506500 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 61506500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75007296).

61506500 is an abundant number, since it is smaller than the sum of its proper divisors (88508092).

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

61506500 is a wasteful number, since it uses less digits than its factorization.

61506500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294 (or 282 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 61506500 is about 7842.6079845929. The cubic root of 61506500 is about 394.7362443656.

The spelling of 61506500 in words is "sixty-one million, five hundred six thousand, five hundred".