61821924 has 24 divisors (see below), whose sum is σ = 146079360. Its totient is φ = 20346144.

The previous prime is 61821923. The next prime is 61821941. The reversal of 61821924 is 42912816.

It is not an unprimeable number, because it can be changed into a prime (61821923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31659 + ... + 33554.

It is an arithmetic number, because the mean of its divisors is an integer number (6086640).

Almost surely, 2^61821924 is an apocalyptic number.

It is an amenable number.

61821924 is an abundant number, since it is smaller than the sum of its proper divisors (84257436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61821924 is a wasteful number, since it uses less digits than its factorization.

61821924 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65299 (or 65297 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 61821924 is about 7862.6919054482. The cubic root of 61821924 is about 395.4098699119.

The spelling of 61821924 in words is "sixty-one million, eight hundred twenty-one thousand, nine hundred twenty-four".