64890551 has 8 divisors (see below), whose sum is σ = 70848000. Its totient is φ = 58942840.

The previous prime is 64890509. The next prime is 64890557. The reversal of 64890551 is 15509846.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64890551 - 2²² = 60696247 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 (64890557) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 25160 + ... + 27618.

It is an arithmetic number, because the mean of its divisors is an integer number (8856000).

Almost surely, 2^64890551 is an apocalyptic number.

64890551 is a deficient number, since it is larger than the sum of its proper divisors (5957449).

64890551 is a wasteful number, since it uses less digits than its factorization.

64890551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4869.

The product of its (nonzero) digits is 43200, while the sum is 38.

The square root of 64890551 is about 8055.4671497065. The cubic root of 64890551 is about 401.8467750164.

The spelling of 64890551 in words is "sixty-four million, eight hundred ninety thousand, five hundred fifty-one".