1628810740 has 12 divisors (see below), whose sum is σ = 3420502596. Its totient is φ = 651524288.

The previous prime is 1628810737. The next prime is 1628810741. The reversal of 1628810740 is 470188261.

It can be written as a sum of positive squares in 2 ways, for example, as 220760164 + 1408050576 = 14858^2 + 37524^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1628810740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628810741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40720249 + ... + 40720288.

It is an arithmetic number, because the mean of its divisors is an integer number (285041883).

Almost surely, 2^1628810740 is an apocalyptic number.

1628810740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628810740 is an abundant number, since it is smaller than the sum of its proper divisors (1791691856).

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

1628810740 is a wasteful number, since it uses less digits than its factorization.

1628810740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81440546 (or 81440544 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 1628810740 is about 40358.5274756154. The cubic root of 1628810740 is about 1176.5856341229.

It can be divided in two parts, 16288 and 10740, that added together give a triangular number (27028 = T₂₃₂).

The spelling of 1628810740 in words is "one billion, six hundred twenty-eight million, eight hundred ten thousand, seven hundred forty".