1620626049 has 81 divisors (see below), whose sum is σ = 2868070881. Its totient is φ = 913028760.

The previous prime is 1620626041. The next prime is 1620626057. The reversal of 1620626049 is 9406260261.

The square root of 1620626049 is 40257.

It is a perfect power (a square), and thus also a powerful number.

1620626049 is a `hidden beast` number, since 1 + 6 + 20 + 626 + 0 + 4 + 9 = 666.

It is an interprime number because it is at equal distance from previous prime (1620626041) and next prime (1620626057).

It is a tau number, because it is divible by the number of its divisors (81).

It is not a de Polignac number, because 1620626049 - 2³ = 1620626041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1620626041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 22825684 + ... + 22825754.

Almost surely, 2^1620626049 is an apocalyptic number.

1620626049 is the 40257-th square number.

1620626049 is the 20129-th centered octagonal number.

It is an amenable number.

1620626049 is a deficient number, since it is larger than the sum of its proper divisors (1247444832).

1620626049 is an frugal number, since it uses more digits than its factorization.

1620626049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180 (or 81 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The cubic root of 1620626049 is about 1174.6115629262.

Multiplying 1620626049 by its sum of digits (36), we get a square (58342537764 = 241542²).

The spelling of 1620626049 in words is "one billion, six hundred twenty million, six hundred twenty-six thousand, forty-nine".