61650819 has 24 divisors (see below), whose sum is σ = 91243152. Its totient is φ = 40098240.

The previous prime is 61650709. The next prime is 61650821. The reversal of 61650819 is 91805616.

It is not a de Polignac number, because 61650819 - 2¹² = 61646723 is a prime.

It is a super-2 number, since 2×61650819² = 7601646966741522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61650829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146229 + ... + 146649.

It is an arithmetic number, because the mean of its divisors is an integer number (3801798).

Almost surely, 2^61650819 is an apocalyptic number.

61650819 is a deficient number, since it is larger than the sum of its proper divisors (29592333).

61650819 is a wasteful number, since it uses less digits than its factorization.

61650819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787 (or 784 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 61650819 is about 7851.8035507774. The cubic root of 61650819 is about 395.0447398984.

The spelling of 61650819 in words is "sixty-one million, six hundred fifty thousand, eight hundred nineteen".