1620497652 has 12 divisors (see below), whose sum is σ = 3781161216. Its totient is φ = 540165880.

The previous prime is 1620497611. The next prime is 1620497657. The reversal of 1620497652 is 2567940261.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620497657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67520724 + ... + 67520747.

It is an arithmetic number, because the mean of its divisors is an integer number (315096768).

Almost surely, 2^1620497652 is an apocalyptic number.

1620497652 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1620497652 is an abundant number, since it is smaller than the sum of its proper divisors (2160663564).

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

1620497652 is a wasteful number, since it uses less digits than its factorization.

1620497652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135041478 (or 135041476 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 1620497652 is about 40255.4052519659. The cubic root of 1620497652 is about 1174.5805418723.

The spelling of 1620497652 in words is "one billion, six hundred twenty million, four hundred ninety-seven thousand, six hundred fifty-two".