1628740730 has 8 divisors (see below), whose sum is σ = 2931733332. Its totient is φ = 651496288.

The previous prime is 1628740723. The next prime is 1628740733. The reversal of 1628740730 is 370478261.

It can be written as a sum of positive squares in 2 ways, for example, as 1421063809 + 207676921 = 37697^2 + 14411^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1628740733) 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, 81437027 + ... + 81437046.

Almost surely, 2^1628740730 is an apocalyptic number.

1628740730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1628740730 is a deficient number, since it is larger than the sum of its proper divisors (1302992602).

1628740730 is a wasteful number, since it uses less digits than its factorization.

1628740730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162874080.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 1628740730 is about 40357.6601155221. The cubic root of 1628740730 is about 1176.5687764369.

The spelling of 1628740730 in words is "one billion, six hundred twenty-eight million, seven hundred forty thousand, seven hundred thirty".