64419981 has 8 divisors (see below), whose sum is σ = 86681760. Its totient is φ = 42552432.

The previous prime is 64419961. The next prime is 64419983. The reversal of 64419981 is 18991446.

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

It is not a de Polignac number, because 64419981 - 2⁷ = 64419853 is a prime.

It is a super-2 number, since 2×64419981² = 8299867904080722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64419983) 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, 98175 + ... + 98828.

It is an arithmetic number, because the mean of its divisors is an integer number (10835220).

Almost surely, 2^64419981 is an apocalyptic number.

It is an amenable number.

64419981 is a deficient number, since it is larger than the sum of its proper divisors (22261779).

64419981 is a wasteful number, since it uses less digits than its factorization.

64419981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197115.

The product of its digits is 62208, while the sum is 42.

The square root of 64419981 is about 8026.2058907058. The cubic root of 64419981 is about 400.8730534744.

The spelling of 64419981 in words is "sixty-four million, four hundred nineteen thousand, nine hundred eighty-one".