61550644 has 12 divisors (see below), whose sum is σ = 111428100. Its totient is φ = 29714048.

The previous prime is 61550639. The next prime is 61550651. The reversal of 61550644 is 44605516.

It can be written as a sum of positive squares in 2 ways, for example, as 51552400 + 9998244 = 7180^2 + 3162^2 .

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, 265189 + ... + 265420.

It is an arithmetic number, because the mean of its divisors is an integer number (9285675).

Almost surely, 2^61550644 is an apocalyptic number.

It is an amenable number.

61550644 is a deficient number, since it is larger than the sum of its proper divisors (49877456).

61550644 is a wasteful number, since it uses less digits than its factorization.

61550644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530642 (or 530640 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 61550644 is about 7845.4218497159. The cubic root of 61550644 is about 394.8306575287.

The spelling of 61550644 in words is "sixty-one million, five hundred fifty thousand, six hundred forty-four".