1620957357 has 12 divisors (see below), whose sum is σ = 2416911744. Its totient is φ = 1045778760.

The previous prime is 1620957343. The next prime is 1620957379. The reversal of 1620957357 is 7537590261.

1620957357 is a `hidden beast` number, since 1 + 6 + 20 + 9 + 573 + 57 = 666.

It is not a de Polignac number, because 1620957357 - 2⁸ = 1620957101 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620957307) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2904663 + ... + 2905220.

It is an arithmetic number, because the mean of its divisors is an integer number (201409312).

Almost surely, 2^1620957357 is an apocalyptic number.

It is an amenable number.

1620957357 is a deficient number, since it is larger than the sum of its proper divisors (795954387).

1620957357 is a wasteful number, since it uses less digits than its factorization.

1620957357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5809920 (or 5809917 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 45.

The square root of 1620957357 is about 40261.1147014089. The cubic root of 1620957357 is about 1174.6916002451.

The spelling of 1620957357 in words is "one billion, six hundred twenty million, nine hundred fifty-seven thousand, three hundred fifty-seven".