61125720 has 64 divisors (see below), whose sum is σ = 191358720. Its totient is φ = 15590784.

The previous prime is 61125703. The next prime is 61125733. The reversal of 61125720 is 2752116.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 8314 + ... + 13833.

It is an arithmetic number, because the mean of its divisors is an integer number (2989980).

Almost surely, 2^61125720 is an apocalyptic number.

61125720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

61125720 is an abundant number, since it is smaller than the sum of its proper divisors (130233000).

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

61125720 is a wasteful number, since it uses less digits than its factorization.

61125720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22184 (or 22180 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 61125720 is about 7818.2939315429. The cubic root of 61125720 is about 393.9199679405.

Adding to 61125720 its reverse (2752116), we get a palindrome (63877836).

The spelling of 61125720 in words is "sixty-one million, one hundred twenty-five thousand, seven hundred twenty".