646726236 has 48 divisors (see below), whose sum is σ = 1695773184. Its totient is φ = 190339776.

The previous prime is 646726211. The next prime is 646726261. The reversal of 646726236 is 632627646.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (646726211) and next prime (646726261).

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, 86536 + ... + 93711.

It is an arithmetic number, because the mean of its divisors is an integer number (35328608).

Almost surely, 2^646726236 is an apocalyptic number.

It is an amenable number.

646726236 is an abundant number, since it is smaller than the sum of its proper divisors (1049046948).

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

646726236 is a wasteful number, since it uses less digits than its factorization.

646726236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180290 (or 180288 counting only the distinct ones).

The product of its digits is 435456, while the sum is 42.

The square root of 646726236 is about 25430.8127278701. The cubic root of 646726236 is about 864.7823685398.

The spelling of 646726236 in words is "six hundred forty-six million, seven hundred twenty-six thousand, two hundred thirty-six".