64764551 has 4 divisors (see below), whose sum is σ = 65071704. Its totient is φ = 64457400.

The previous prime is 64764529. The next prime is 64764563. The reversal of 64764551 is 15546746.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64764551 - 2¹⁰ = 64763527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64764451) 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, 153260 + ... + 153681.

It is an arithmetic number, because the mean of its divisors is an integer number (16267926).

Almost surely, 2^64764551 is an apocalyptic number.

64764551 is a deficient number, since it is larger than the sum of its proper divisors (307153).

64764551 is a wasteful number, since it uses less digits than its factorization.

64764551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307152.

The product of its digits is 100800, while the sum is 38.

The square root of 64764551 is about 8047.6425740710. The cubic root of 64764551 is about 401.5865136997.

The spelling of 64764551 in words is "sixty-four million, seven hundred sixty-four thousand, five hundred fifty-one".