61949980 has 12 divisors (see below), whose sum is σ = 130095000. Its totient is φ = 24779984.

The previous prime is 61949977. The next prime is 61950001. The reversal of 61949980 is 8994916.

It is a self number, because there is not a number n which added to its sum of digits gives 61949980.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1548730 + ... + 1548769.

It is an arithmetic number, because the mean of its divisors is an integer number (10841250).

Almost surely, 2^61949980 is an apocalyptic number.

It is an amenable number.

61949980 is an abundant number, since it is smaller than the sum of its proper divisors (68145020).

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

61949980 is a wasteful number, since it uses less digits than its factorization.

61949980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097508 (or 3097506 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 61949980 is about 7870.8309599432. The cubic root of 61949980 is about 395.6826948378.

The spelling of 61949980 in words is "sixty-one million, nine hundred forty-nine thousand, nine hundred eighty".