64780551 has 12 divisors (see below), whose sum is σ = 102078600. Its totient is φ = 39260880.

The previous prime is 64780543. The next prime is 64780561. The reversal of 64780551 is 15508746.

64780551 is a `hidden beast` number, since 647 + 8 + 0 + 5 + 5 + 1 = 666.

It is not a de Polignac number, because 64780551 - 2³ = 64780543 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64780531) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 327076 + ... + 327273.

It is an arithmetic number, because the mean of its divisors is an integer number (8506550).

Almost surely, 2^64780551 is an apocalyptic number.

64780551 is a deficient number, since it is larger than the sum of its proper divisors (37298049).

64780551 is a wasteful number, since it uses less digits than its factorization.

64780551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654366 (or 654363 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 64780551 is about 8048.6365926162. The cubic root of 64780551 is about 401.6195814559.

The spelling of 64780551 in words is "sixty-four million, seven hundred eighty thousand, five hundred fifty-one".