646689435 has 32 divisors (see below), whose sum is σ = 1252081152. Its totient is φ = 278238720.

The previous prime is 646689431. The next prime is 646689443. The reversal of 646689435 is 534986646.

It is a happy number.

It is not a de Polignac number, because 646689435 - 2² = 646689431 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (646689431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179361 + ... + 182930.

It is an arithmetic number, because the mean of its divisors is an integer number (39127536).

Almost surely, 2^646689435 is an apocalyptic number.

646689435 is a deficient number, since it is larger than the sum of its proper divisors (605391717).

646689435 is a wasteful number, since it uses less digits than its factorization.

646689435 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362323.

The product of its digits is 3732480, while the sum is 51.

The square root of 646689435 is about 25430.0891661826. The cubic root of 646689435 is about 864.7659651748.

The spelling of 646689435 in words is "six hundred forty-six million, six hundred eighty-nine thousand, four hundred thirty-five".