64778141 has 8 divisors (see below), whose sum is σ = 67101600. Its totient is φ = 62460720.

The previous prime is 64778123. The next prime is 64778171. The reversal of 64778141 is 14187746.

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

It is a cyclic number.

It is not a de Polignac number, because 64778141 - 2¹⁴ = 64761757 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64778095 and 64778104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64778101) 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, 41546 + ... + 43076.

It is an arithmetic number, because the mean of its divisors is an integer number (8387700).

Almost surely, 2^64778141 is an apocalyptic number.

It is an amenable number.

64778141 is a deficient number, since it is larger than the sum of its proper divisors (2323459).

64778141 is a wasteful number, since it uses less digits than its factorization.

64778141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3019.

The product of its digits is 37632, while the sum is 38.

The square root of 64778141 is about 8048.4868764259. The cubic root of 64778141 is about 401.6146009735.

The spelling of 64778141 in words is "sixty-four million, seven hundred seventy-eight thousand, one hundred forty-one".