61816904 has 8 divisors (see below), whose sum is σ = 115906710. Its totient is φ = 30908448.

The previous prime is 61816903. The next prime is 61816919. The reversal of 61816904 is 40961816.

It can be written as a sum of positive squares in only one way, i.e., 45832900 + 15984004 = 6770^2 + 3998^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61816903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863549 + ... + 3863564.

Almost surely, 2^61816904 is an apocalyptic number.

It is an amenable number.

61816904 is a deficient number, since it is larger than the sum of its proper divisors (54089806).

61816904 is a wasteful number, since it uses less digits than its factorization.

61816904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7727119 (or 7727115 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 61816904 is about 7862.3726698752. The cubic root of 61816904 is about 395.3991670677.

The spelling of 61816904 in words is "sixty-one million, eight hundred sixteen thousand, nine hundred four".