64940747 has 4 divisors (see below), whose sum is σ = 65103096. Its totient is φ = 64778400.

The previous prime is 64940723. The next prime is 64940767. The reversal of 64940747 is 74704946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74704946 = 2 ⋅37352473.

It is a cyclic number.

It is not a de Polignac number, because 64940747 - 2⁶ = 64940683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64940717) 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, 80573 + ... + 81374.

It is an arithmetic number, because the mean of its divisors is an integer number (16275774).

Almost surely, 2^64940747 is an apocalyptic number.

64940747 is a deficient number, since it is larger than the sum of its proper divisors (162349).

64940747 is a wasteful number, since it uses less digits than its factorization.

64940747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162348.

The product of its (nonzero) digits is 169344, while the sum is 41.

The square root of 64940747 is about 8058.5821953989. The cubic root of 64940747 is about 401.9503643245.

The spelling of 64940747 in words is "sixty-four million, nine hundred forty thousand, seven hundred forty-seven".