1628813401 has 4 divisors (see below), whose sum is σ = 1724625972. Its totient is φ = 1533000832.

The previous prime is 1628813369. The next prime is 1628813419. The reversal of 1628813401 is 1043188261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1046846025 + 581967376 = 32355^2 + 24124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628813401 - 2⁵ = 1628813369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628883401) 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, 47906260 + ... + 47906293.

It is an arithmetic number, because the mean of its divisors is an integer number (431156493).

Almost surely, 2^1628813401 is an apocalyptic number.

It is an amenable number.

1628813401 is a deficient number, since it is larger than the sum of its proper divisors (95812571).

1628813401 is an equidigital number, since it uses as much as digits as its factorization.

1628813401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95812570.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 1628813401 is about 40358.5604426124. The cubic root of 1628813401 is about 1176.5862748548.

The spelling of 1628813401 in words is "one billion, six hundred twenty-eight million, eight hundred thirteen thousand, four hundred one".