61941640 has 16 divisors (see below), whose sum is σ = 139368780. Its totient is φ = 24776640.

The previous prime is 61941617. The next prime is 61941661. The reversal of 61941640 is 4614916.

It can be written as a sum of positive squares in 2 ways, for example, as 61559716 + 381924 = 7846^2 + 618^2 .

It is a nialpdrome in base 13.

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, 774231 + ... + 774310.

Almost surely, 2^61941640 is an apocalyptic number.

It is an amenable number.

61941640 is an abundant number, since it is smaller than the sum of its proper divisors (77427140).

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

61941640 is a wasteful number, since it uses less digits than its factorization.

61941640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1548552 (or 1548548 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61941640 is about 7870.3011378219. The cubic root of 61941640 is about 395.6649378142.

The spelling of 61941640 in words is "sixty-one million, nine hundred forty-one thousand, six hundred forty".