64642047 has 8 divisors (see below), whose sum is σ = 90725760. Its totient is φ = 40826520.

The previous prime is 64642031. The next prime is 64642049. The reversal of 64642047 is 74024646.

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

It is not a de Polignac number, because 64642047 - 2⁴ = 64642031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64641999 and 64642017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64642049) 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, 566979 + ... + 567092.

It is an arithmetic number, because the mean of its divisors is an integer number (11340720).

Almost surely, 2^64642047 is an apocalyptic number.

64642047 is a deficient number, since it is larger than the sum of its proper divisors (26083713).

64642047 is a wasteful number, since it uses less digits than its factorization.

64642047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134093.

The product of its (nonzero) digits is 32256, while the sum is 33.

The square root of 64642047 is about 8040.0277984594. The cubic root of 64642047 is about 401.3331497597. Note that the first 3 decimals are identical.

The spelling of 64642047 in words is "sixty-four million, six hundred forty-two thousand, forty-seven".