61501944 has 64 divisors (see below), whose sum is σ = 179481600. Its totient is φ = 17195904.

The previous prime is 61501907. The next prime is 61501963. The reversal of 61501944 is 44910516.

It is a happy number.

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, 4002 + ... + 11790.

It is an arithmetic number, because the mean of its divisors is an integer number (2804400).

Almost surely, 2^61501944 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 61501944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89740800).

61501944 is an abundant number, since it is smaller than the sum of its proper divisors (117979656).

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

61501944 is a wasteful number, since it uses less digits than its factorization.

61501944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7852 (or 7848 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 61501944 is about 7842.3175146126. The cubic root of 61501944 is about 394.7264976302.

The spelling of 61501944 in words is "sixty-one million, five hundred one thousand, nine hundred forty-four".