1620670715 has 4 divisors (see below), whose sum is σ = 1944804864. Its totient is φ = 1296536568.

The previous prime is 1620670703. The next prime is 1620670739. The reversal of 1620670715 is 5170760261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5170760261 = 149 ⋅34703089.

It is a cyclic number.

It is not a de Polignac number, because 1620670715 - 2¹⁰ = 1620669691 is a prime.

It is a super-2 number, since 2×1620670715² = 5253147132917222450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162067067 + ... + 162067076.

It is an arithmetic number, because the mean of its divisors is an integer number (486201216).

Almost surely, 2^1620670715 is an apocalyptic number.

1620670715 is a deficient number, since it is larger than the sum of its proper divisors (324134149).

1620670715 is an equidigital number, since it uses as much as digits as its factorization.

1620670715 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324134148.

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 1620670715 is about 40257.5547568404. The cubic root of 1620670715 is about 1174.6223539654.

The spelling of 1620670715 in words is "one billion, six hundred twenty million, six hundred seventy thousand, seven hundred fifteen".