61681204 has 24 divisors (see below), whose sum is σ = 117845000. Its totient is φ = 28076544.

The previous prime is 61681181. The next prime is 61681237. The reversal of 61681204 is 40218616.

It can be written as a sum of positive squares in 4 ways, for example, as 4708900 + 56972304 = 2170^2 + 7548^2 .

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, 4329 + ... + 11920.

Almost surely, 2^61681204 is an apocalyptic number.

It is an amenable number.

61681204 is a deficient number, since it is larger than the sum of its proper divisors (56163796).

61681204 is a wasteful number, since it uses less digits than its factorization.

61681204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16339 (or 16337 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 61681204 is about 7853.7382181990. The cubic root of 61681204 is about 395.1096293471.

The spelling of 61681204 in words is "sixty-one million, six hundred eighty-one thousand, two hundred four".