64687297490 has 16 divisors (see below), whose sum is σ = 117839994048. Its totient is φ = 25563172656.

The previous prime is 64687297489. The next prime is 64687297501. The reversal of 64687297490 is 9479278646.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38967422 + ... + 38969081.

It is an arithmetic number, because the mean of its divisors is an integer number (7364999628).

Almost surely, 2^64687297490 is an apocalyptic number.

64687297490 is a deficient number, since it is larger than the sum of its proper divisors (53152696558).

64687297490 is a wasteful number, since it uses less digits than its factorization.

64687297490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77936593.

The product of its (nonzero) digits is 36578304, while the sum is 62.

The spelling of 64687297490 in words is "sixty-four billion, six hundred eighty-seven million, two hundred ninety-seven thousand, four hundred ninety".