61808619 has 16 divisors (see below), whose sum is σ = 84423168. Its totient is φ = 40205472.

The previous prime is 61808597. The next prime is 61808641. The reversal of 61808619 is 91680816.

It is an interprime number because it is at equal distance from previous prime (61808597) and next prime (61808641).

It is not a de Polignac number, because 61808619 - 2⁷ = 61808491 is a prime.

It is a super-2 number, since 2×61808619² = 7640610765374322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61808819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78144 + ... + 78930.

It is an arithmetic number, because the mean of its divisors is an integer number (5276448).

Almost surely, 2^61808619 is an apocalyptic number.

61808619 is a deficient number, since it is larger than the sum of its proper divisors (22614549).

61808619 is a wasteful number, since it uses less digits than its factorization.

61808619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 61808619 is about 7861.8457756433. The cubic root of 61808619 is about 395.3815018432.

The spelling of 61808619 in words is "sixty-one million, eight hundred eight thousand, six hundred nineteen".