61719819 has 8 divisors (see below), whose sum is σ = 94049280. Its totient is φ = 35268456.

The previous prime is 61719799. The next prime is 61719829. The reversal of 61719819 is 91891716.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61719819 - 2⁸ = 61719563 is a prime.

It is a super-2 number, since 2×61719819² = 7618672114785522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61719829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1469499 + ... + 1469540.

It is an arithmetic number, because the mean of its divisors is an integer number (11756160).

Almost surely, 2^61719819 is an apocalyptic number.

61719819 is a deficient number, since it is larger than the sum of its proper divisors (32329461).

61719819 is a wasteful number, since it uses less digits than its factorization.

61719819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2939049.

The product of its digits is 27216, while the sum is 42.

The square root of 61719819 is about 7856.1962169997. The cubic root of 61719819 is about 395.1920638360.

The spelling of 61719819 in words is "sixty-one million, seven hundred nineteen thousand, eight hundred nineteen".