1628649340 has 12 divisors (see below), whose sum is σ = 3420163656. Its totient is φ = 651459728.

The previous prime is 1628649331. The next prime is 1628649371. The reversal of 1628649340 is 439468261.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40716214 + ... + 40716253.

It is an arithmetic number, because the mean of its divisors is an integer number (285013638).

Almost surely, 2^1628649340 is an apocalyptic number.

1628649340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628649340 is an abundant number, since it is smaller than the sum of its proper divisors (1791514316).

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

1628649340 is a wasteful number, since it uses less digits than its factorization.

1628649340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81432476 (or 81432474 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 43.

The square root of 1628649340 is about 40356.5278486641. The cubic root of 1628649340 is about 1176.5467699403.

The spelling of 1628649340 in words is "one billion, six hundred twenty-eight million, six hundred forty-nine thousand, three hundred forty".