61644542 has 32 divisors (see below), whose sum is σ = 98233344. Its totient is φ = 28980000.

The previous prime is 61644497. The next prime is 61644547. The reversal of 61644542 is 24544616.

It is a junction number, because it is equal to n+sod(n) for n = 61644499 and 61644508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61644547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408167 + ... + 408317.

It is an arithmetic number, because the mean of its divisors is an integer number (3069792).

Almost surely, 2^61644542 is an apocalyptic number.

61644542 is a deficient number, since it is larger than the sum of its proper divisors (36588802).

61644542 is a wasteful number, since it uses less digits than its factorization.

61644542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its digits is 23040, while the sum is 32.

The square root of 61644542 is about 7851.4038235210. The cubic root of 61644542 is about 395.0313322366.

The spelling of 61644542 in words is "sixty-one million, six hundred forty-four thousand, five hundred forty-two".