1820628541 has 8 divisors (see below), whose sum is σ = 1861909560. Its totient is φ = 1779789312.

The previous prime is 1820628517. The next prime is 1820628571. The reversal of 1820628541 is 1458260281.

It can be written as a sum of positive squares in 4 ways, for example, as 92563641 + 1728064900 = 9621^2 + 41570^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1820628541 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1820628541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820628571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102106 + ... + 118603.

It is an arithmetic number, because the mean of its divisors is an integer number (232738695).

Almost surely, 2^1820628541 is an apocalyptic number.

It is an amenable number.

1820628541 is a deficient number, since it is larger than the sum of its proper divisors (41281019).

1820628541 is a wasteful number, since it uses less digits than its factorization.

1820628541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220895.

The product of its (nonzero) digits is 30720, while the sum is 37.

The square root of 1820628541 is about 42668.8239936373. The cubic root of 1820628541 is about 1221.0696837585.

The spelling of 1820628541 in words is "one billion, eight hundred twenty million, six hundred twenty-eight thousand, five hundred forty-one".