643654290 has 16 divisors (see below), whose sum is σ = 1544770368. Its totient is φ = 171641136.

The previous prime is 643654283. The next prime is 643654301. The reversal of 643654290 is 92456346.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10727542 + ... + 10727601.

It is an arithmetic number, because the mean of its divisors is an integer number (96548148).

Almost surely, 2^643654290 is an apocalyptic number.

643654290 is an abundant number, since it is smaller than the sum of its proper divisors (901116078).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

643654290 is a wasteful number, since it uses less digits than its factorization.

643654290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21455153.

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 643654290 is about 25370.3427253161. The cubic root of 643654290 is about 863.4109577082.

It can be divided in two parts, 6436 and 54290, that added together give a triangular number (60726 = T₃₄₈).

The spelling of 643654290 in words is "six hundred forty-three million, six hundred fifty-four thousand, two hundred ninety".