64406043787 has 12 divisors (see below), whose sum is σ = 68909748040. Its totient is φ = 60181318656.

The previous prime is 64406043749. The next prime is 64406043791. The reversal of 64406043787 is 78734060446.

It is a happy number.

It is not a de Polignac number, because 64406043787 - 2¹⁹ = 64405519499 is a prime.

It is a super-2 number, since 2×64406043787² (a number of 22 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64406043787.

It is not an unprimeable number, because it can be changed into a prime (64406043187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 761478 + ... + 841819.

Almost surely, 2^64406043787 is an apocalyptic number.

64406043787 is a deficient number, since it is larger than the sum of its proper divisors (4503704253).

64406043787 is a wasteful number, since it uses less digits than its factorization.

64406043787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1603470 (or 1603453 counting only the distinct ones).

The product of its (nonzero) digits is 2709504, while the sum is 49.

The spelling of 64406043787 in words is "sixty-four billion, four hundred six million, forty-three thousand, seven hundred eighty-seven".