1620436340 has 24 divisors (see below), whose sum is σ = 3512689152. Its totient is φ = 627265440.

The previous prime is 1620436331. The next prime is 1620436373. The reversal of 1620436340 is 436340261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1306184 + ... + 1307423.

It is an arithmetic number, because the mean of its divisors is an integer number (146362048).

Almost surely, 2^1620436340 is an apocalyptic number.

1620436340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1620436340 is an abundant number, since it is smaller than the sum of its proper divisors (1892252812).

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

1620436340 is a wasteful number, since it uses less digits than its factorization.

1620436340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2613647 (or 2613645 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 1620436340 is about 40254.6437072793. The cubic root of 1620436340 is about 1174.5657281533.

The spelling of 1620436340 in words is "one billion, six hundred twenty million, four hundred thirty-six thousand, three hundred forty".