61994320 has 20 divisors (see below), whose sum is σ = 144136980. Its totient is φ = 24797696.

The previous prime is 61994297. The next prime is 61994333. The reversal of 61994320 is 2349916.

It can be written as a sum of positive squares in 2 ways, for example, as 48274704 + 13719616 = 6948^2 + 3704^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 387385 + ... + 387544.

It is an arithmetic number, because the mean of its divisors is an integer number (7206849).

Almost surely, 2^61994320 is an apocalyptic number.

It is an amenable number.

61994320 is an abundant number, since it is smaller than the sum of its proper divisors (82142660).

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

61994320 is a wasteful number, since it uses less digits than its factorization.

61994320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774942 (or 774936 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 61994320 is about 7873.6471853900. The cubic root of 61994320 is about 395.7770741342. Note that the first 3 decimals are identical.

The spelling of 61994320 in words is "sixty-one million, nine hundred ninety-four thousand, three hundred twenty".