64870973 has 4 divisors (see below), whose sum is σ = 65033148. Its totient is φ = 64708800.

The previous prime is 64870969. The next prime is 64871011. The reversal of 64870973 is 37907846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37907846 = 2 ⋅18953923.

It can be written as a sum of positive squares in 2 ways, for example, as 64432729 + 438244 = 8027^2 + 662^2 .

It is a cyclic number.

It is not a de Polignac number, because 64870973 - 2² = 64870969 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64873973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80486 + ... + 81287.

It is an arithmetic number, because the mean of its divisors is an integer number (16258287).

Almost surely, 2^64870973 is an apocalyptic number.

It is an amenable number.

64870973 is a deficient number, since it is larger than the sum of its proper divisors (162175).

64870973 is a wasteful number, since it uses less digits than its factorization.

64870973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162174.

The product of its (nonzero) digits is 254016, while the sum is 44.

The square root of 64870973 is about 8054.2518584906. The cubic root of 64870973 is about 401.8063574857.

The spelling of 64870973 in words is "sixty-four million, eight hundred seventy thousand, nine hundred seventy-three".