61501820 has 12 divisors (see below), whose sum is σ = 129153864. Its totient is φ = 24600720.

The previous prime is 61501819. The next prime is 61501831. The reversal of 61501820 is 2810516.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1537526 + ... + 1537565.

It is an arithmetic number, because the mean of its divisors is an integer number (10762822).

Almost surely, 2^61501820 is an apocalyptic number.

It is an amenable number.

61501820 is an abundant number, since it is smaller than the sum of its proper divisors (67652044).

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

61501820 is a wasteful number, since it uses less digits than its factorization.

61501820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3075100 (or 3075098 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 61501820 is about 7842.3096087824. The cubic root of 61501820 is about 394.7262323480.

The spelling of 61501820 in words is "sixty-one million, five hundred one thousand, eight hundred twenty".