64139002 has 4 divisors (see below), whose sum is σ = 96208506. Its totient is φ = 32069500.

The previous prime is 64138993. The next prime is 64139029. The reversal of 64139002 is 20093146.

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., 63059481 + 1079521 = 7941^2 + 1039^2 .

It is a super-2 number, since 2×64139002² = 8227623155112008, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16034749 + ... + 16034752.

Almost surely, 2^64139002 is an apocalyptic number.

64139002 is a deficient number, since it is larger than the sum of its proper divisors (32069504).

64139002 is a wasteful number, since it uses less digits than its factorization.

64139002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32069503.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 64139002 is about 8008.6829129389. The cubic root of 64139002 is about 400.2893781003.

The spelling of 64139002 in words is "sixty-four million, one hundred thirty-nine thousand, two".