61720808 has 8 divisors (see below), whose sum is σ = 115726530. Its totient is φ = 30860400.

The previous prime is 61720801. The next prime is 61720849. The reversal of 61720808 is 80802716.

It can be written as a sum of positive squares in only one way, i.e., 59876644 + 1844164 = 7738^2 + 1358^2 .

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 (61720801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3857543 + ... + 3857558.

Almost surely, 2^61720808 is an apocalyptic number.

It is an amenable number.

61720808 is a deficient number, since it is larger than the sum of its proper divisors (54005722).

61720808 is a wasteful number, since it uses less digits than its factorization.

61720808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7715107 (or 7715103 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 32.

The square root of 61720808 is about 7856.2591606947. The cubic root of 61720808 is about 395.1941746807.

The spelling of 61720808 in words is "sixty-one million, seven hundred twenty thousand, eight hundred eight".