64493906 has 4 divisors (see below), whose sum is σ = 96740862. Its totient is φ = 32246952.

The previous prime is 64493899. The next prime is 64493921. The reversal of 64493906 is 60939446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 60918025 + 3575881 = 7805^2 + 1891^2 .

It is a super-2 number, since 2×64493906² = 8318927822273672, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16123475 + ... + 16123478.

Almost surely, 2^64493906 is an apocalyptic number.

64493906 is a deficient number, since it is larger than the sum of its proper divisors (32246956).

64493906 is a wasteful number, since it uses less digits than its factorization.

64493906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32246955.

The product of its (nonzero) digits is 139968, while the sum is 41.

The square root of 64493906 is about 8030.8097972745. The cubic root of 64493906 is about 401.0263351713.

The spelling of 64493906 in words is "sixty-four million, four hundred ninety-three thousand, nine hundred six".