1620351546 has 32 divisors (see below), whose sum is σ = 3546652608. Its totient is φ = 489440640.

The previous prime is 1620351503. The next prime is 1620351553. The reversal of 1620351546 is 6451530261.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18561 + ... + 59876.

It is an arithmetic number, because the mean of its divisors is an integer number (110832894).

Almost surely, 2^1620351546 is an apocalyptic number.

1620351546 is an abundant number, since it is smaller than the sum of its proper divisors (1926301062).

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

1620351546 is a wasteful number, since it uses less digits than its factorization.

1620351546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78766.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 1620351546 is about 40253.5904733975. The cubic root of 1620351546 is about 1174.5452402840.

The spelling of 1620351546 in words is "one billion, six hundred twenty million, three hundred fifty-one thousand, five hundred forty-six".