64138747 has 8 divisors (see below), whose sum is σ = 64631952. Its totient is φ = 63648000.

The previous prime is 64138741. The next prime is 64138751. The reversal of 64138747 is 74783146.

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 64138747 - 2⁷ = 64138619 is a prime.

It is a super-2 number, since 2×64138747² = 8227557733460018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64138741) 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, 122847 + ... + 123367.

It is an arithmetic number, because the mean of its divisors is an integer number (8078994).

Almost surely, 2^64138747 is an apocalyptic number.

64138747 is a deficient number, since it is larger than the sum of its proper divisors (493205).

64138747 is a wasteful number, since it uses less digits than its factorization.

64138747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1229.

The product of its digits is 112896, while the sum is 40.

The square root of 64138747 is about 8008.6669927023. Note that the first 3 decimals coincide. The cubic root of 64138747 is about 400.2888476174.

The spelling of 64138747 in words is "sixty-four million, one hundred thirty-eight thousand, seven hundred forty-seven".