646738134 has 32 divisors (see below), whose sum is σ = 1488062976. Its totient is φ = 183556800.

The previous prime is 646738129. The next prime is 646738177. The reversal of 646738134 is 431837646.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44647 + ... + 57330.

It is an arithmetic number, because the mean of its divisors is an integer number (46501968).

Almost surely, 2^646738134 is an apocalyptic number.

646738134 is an abundant number, since it is smaller than the sum of its proper divisors (841324842).

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

646738134 is a wasteful number, since it uses less digits than its factorization.

646738134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102140.

The product of its digits is 290304, while the sum is 42.

The square root of 646738134 is about 25431.0466556137. The cubic root of 646738134 is about 864.7876717201.

The spelling of 646738134 in words is "six hundred forty-six million, seven hundred thirty-eight thousand, one hundred thirty-four".