1620226385 has 8 divisors (see below), whose sum is σ = 1944646056. Its totient is φ = 1295931520.

The previous prime is 1620226381. The next prime is 1620226393. The reversal of 1620226385 is 5836220261.

It can be written as a sum of positive squares in 4 ways, for example, as 205262929 + 1414963456 = 14327^2 + 37616^2 .

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

It is not a de Polignac number, because 1620226385 - 2² = 1620226381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620226381) 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, 245 + ... + 56925.

It is an arithmetic number, because the mean of its divisors is an integer number (243080757).

Almost surely, 2^1620226385 is an apocalyptic number.

It is an amenable number.

1620226385 is a deficient number, since it is larger than the sum of its proper divisors (324419671).

1620226385 is an equidigital number, since it uses as much as digits as its factorization.

1620226385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62403.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1620226385 is about 40252.0357870257. The cubic root of 1620226385 is about 1174.5149976612.

The spelling of 1620226385 in words is "one billion, six hundred twenty million, two hundred twenty-six thousand, three hundred eighty-five".