64642953 has 8 divisors (see below), whose sum is σ = 86527008. Its totient is φ = 42927104.

The previous prime is 64642939. The next prime is 64642969. The reversal of 64642953 is 35924646.

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 64642953 - 2¹² = 64638857 is a prime.

It is a super-2 number, since 2×64642953² = 8357422745120418, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64642453) 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, 41151 + ... + 42692.

It is an arithmetic number, because the mean of its divisors is an integer number (10815876).

Almost surely, 2^64642953 is an apocalyptic number.

It is an amenable number.

64642953 is a deficient number, since it is larger than the sum of its proper divisors (21884055).

64642953 is a wasteful number, since it uses less digits than its factorization.

64642953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84103.

The product of its digits is 155520, while the sum is 39.

The square root of 64642953 is about 8040.0841413508. The cubic root of 64642953 is about 401.3350247320.

The spelling of 64642953 in words is "sixty-four million, six hundred forty-two thousand, nine hundred fifty-three".