61533644 has 12 divisors (see below), whose sum is σ = 108750768. Its totient is φ = 30462000.

The previous prime is 61533629. The next prime is 61533649. The reversal of 61533644 is 44633516.

It is a self number, because there is not a number n which added to its sum of digits gives 61533644.

It is not an unprimeable number, because it can be changed into a prime (61533649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75752 + ... + 76559.

It is an arithmetic number, because the mean of its divisors is an integer number (9062564).

Almost surely, 2^61533644 is an apocalyptic number.

It is an amenable number.

61533644 is a deficient number, since it is larger than the sum of its proper divisors (47217124).

61533644 is a wasteful number, since it uses less digits than its factorization.

61533644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152416 (or 152414 counting only the distinct ones).

The product of its digits is 25920, while the sum is 32.

The square root of 61533644 is about 7844.3383404848. The cubic root of 61533644 is about 394.7943040546.

The spelling of 61533644 in words is "sixty-one million, five hundred thirty-three thousand, six hundred forty-four".