61819808 has 24 divisors (see below), whose sum is σ = 122197572. Its totient is φ = 30785536.

The previous prime is 61819801. The next prime is 61819819. The reversal of 61819808 is 80891816.

It can be written as a sum of positive squares in 2 ways, for example, as 42354064 + 19465744 = 6508^2 + 4412^2 .

It is a super-2 number, since 2×61819808² = 7643377322313728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61819801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4466 + ... + 11982.

Almost surely, 2^61819808 is an apocalyptic number.

It is an amenable number.

61819808 is a deficient number, since it is larger than the sum of its proper divisors (60377764).

61819808 is a wasteful number, since it uses less digits than its factorization.

61819808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7784 (or 7776 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 61819808 is about 7862.5573447829. The cubic root of 61819808 is about 395.4053585845.

The spelling of 61819808 in words is "sixty-one million, eight hundred nineteen thousand, eight hundred eight".