64667542 has 4 divisors (see below), whose sum is σ = 97001316. Its totient is φ = 32333770.

The previous prime is 64667531. The next prime is 64667543. The reversal of 64667542 is 24576646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24576646 = 2 ⋅12288323.

It is a super-3 number, since 3×64667542³ (a number of 24 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64667495 and 64667504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64667543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16166884 + ... + 16166887.

It is an arithmetic number, because the mean of its divisors is an integer number (24250329).

Almost surely, 2^64667542 is an apocalyptic number.

64667542 is a deficient number, since it is larger than the sum of its proper divisors (32333774).

64667542 is a wasteful number, since it uses less digits than its factorization.

64667542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32333773.

The product of its digits is 241920, while the sum is 40.

The square root of 64667542 is about 8041.6131466267. The cubic root of 64667542 is about 401.3859051217.

The spelling of 64667542 in words is "sixty-four million, six hundred sixty-seven thousand, five hundred forty-two".