64561619 has 8 divisors (see below), whose sum is σ = 66171072. Its totient is φ = 62957160.

The previous prime is 64561603. The next prime is 64561657. The reversal of 64561619 is 91616546.

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

It is not a de Polignac number, because 64561619 - 2⁴ = 64561603 is a prime.

It is a super-2 number, since 2×64561619² = 8336405295802322, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49364 + ... + 50654.

It is an arithmetic number, because the mean of its divisors is an integer number (8271384).

Almost surely, 2^64561619 is an apocalyptic number.

64561619 is a deficient number, since it is larger than the sum of its proper divisors (1609453).

64561619 is a wasteful number, since it uses less digits than its factorization.

64561619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2497.

The product of its digits is 38880, while the sum is 38.

The square root of 64561619 is about 8035.0245176975. The cubic root of 64561619 is about 401.1666336899.

The spelling of 64561619 in words is "sixty-four million, five hundred sixty-one thousand, six hundred nineteen".