646400734 has 32 divisors (see below), whose sum is σ = 1119799296. Its totient is φ = 274125600.

The previous prime is 646400731. The next prime is 646400737. The reversal of 646400734 is 437004646.

It is an interprime number because it is at equal distance from previous prime (646400731) and next prime (646400737).

It is a self number, because there is not a number n which added to its sum of digits gives 646400734.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646400731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 614509 + ... + 615559.

It is an arithmetic number, because the mean of its divisors is an integer number (34993728).

Almost surely, 2^646400734 is an apocalyptic number.

646400734 is a deficient number, since it is larger than the sum of its proper divisors (473398562).

646400734 is a wasteful number, since it uses less digits than its factorization.

646400734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1480.

The product of its (nonzero) digits is 48384, while the sum is 34.

The square root of 646400734 is about 25424.4121662626. The cubic root of 646400734 is about 864.6372604487.

The spelling of 646400734 in words is "six hundred forty-six million, four hundred thousand, seven hundred thirty-four".