61621564 has 6 divisors (see below), whose sum is σ = 107837744. Its totient is φ = 30810780.

The previous prime is 61621517. The next prime is 61621589. The reversal of 61621564 is 46512616.

61621564 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7702692 + ... + 7702699.

Almost surely, 2^61621564 is an apocalyptic number.

It is an amenable number.

61621564 is a deficient number, since it is larger than the sum of its proper divisors (46216180).

61621564 is a wasteful number, since it uses less digits than its factorization.

61621564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15405395 (or 15405393 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 61621564 is about 7849.9403819392. The cubic root of 61621564 is about 394.9822435003.

The spelling of 61621564 in words is "sixty-one million, six hundred twenty-one thousand, five hundred sixty-four".