1620831465 has 80 divisors (see below), whose sum is σ = 3243721536. Its totient is φ = 767491200.

The previous prime is 1620831463. The next prime is 1620831469. The reversal of 1620831465 is 5641380261.

It is a happy number.

1620831465 is a `hidden beast` number, since 162 + 0 + 8 + 31 + 465 = 666.

It is not a de Polignac number, because 1620831465 - 2¹ = 1620831463 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1620831463) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 187335 + ... + 195795.

Almost surely, 2^1620831465 is an apocalyptic number.

1620831465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1620831465 is an abundant number, since it is smaller than the sum of its proper divisors (1622890071).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620831465 is a wasteful number, since it uses less digits than its factorization.

1620831465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8532 (or 8523 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1620831465 is about 40259.5512270070. The cubic root of 1620831465 is about 1174.6611885663.

The spelling of 1620831465 in words is "one billion, six hundred twenty million, eight hundred thirty-one thousand, four hundred sixty-five".