1628705431 has 8 divisors (see below), whose sum is σ = 1654302384. Its totient is φ = 1603250880.

The previous prime is 1628705411. The next prime is 1628705437. The reversal of 1628705431 is 1345078261.

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

It is a cyclic number.

It is not a de Polignac number, because 1628705431 - 2¹¹ = 1628703383 is a prime.

It is a super-2 number, since 2×1628705431² = 5305362761937791522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628705437) 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, 12430 + ... + 58411.

It is an arithmetic number, because the mean of its divisors is an integer number (206787798).

Almost surely, 2^1628705431 is an apocalyptic number.

1628705431 is a deficient number, since it is larger than the sum of its proper divisors (25596953).

1628705431 is an equidigital number, since it uses as much as digits as its factorization.

1628705431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71201.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 1628705431 is about 40357.2227860144. Note that the first 3 decimals coincide. The cubic root of 1628705431 is about 1176.5602766185.

The spelling of 1628705431 in words is "one billion, six hundred twenty-eight million, seven hundred five thousand, four hundred thirty-one".