61644412 has 24 divisors (see below), whose sum is σ = 110433456. Its totient is φ = 30100608.

The previous prime is 61644409. The next prime is 61644421. The reversal of 61644412 is 21444616.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30258 + ... + 32230.

It is an arithmetic number, because the mean of its divisors is an integer number (4601394).

Almost surely, 2^61644412 is an apocalyptic number.

It is an amenable number.

61644412 is a deficient number, since it is larger than the sum of its proper divisors (48789044).

61644412 is a wasteful number, since it uses less digits than its factorization.

61644412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157 (or 2155 counting only the distinct ones).

The product of its digits is 4608, while the sum is 28.

The square root of 61644412 is about 7851.3955447423. The cubic root of 61644412 is about 395.0310545472.

The spelling of 61644412 in words is "sixty-one million, six hundred forty-four thousand, four hundred twelve".