1620351456 has 96 divisors (see below), whose sum is σ = 4426773120. Its totient is φ = 518536704.

The previous prime is 1620351451. The next prime is 1620351463. The reversal of 1620351456 is 6541530261.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×1620351456² = 5251077681922639872, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620351451) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 240226 + ... + 246878.

It is an arithmetic number, because the mean of its divisors is an integer number (46112220).

Almost surely, 2^1620351456 is an apocalyptic number.

1620351456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620351456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2213386560).

1620351456 is an abundant number, since it is smaller than the sum of its proper divisors (2806421664).

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

1620351456 is a wasteful number, since it uses less digits than its factorization.

1620351456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6768 (or 6760 counting only the distinct ones).

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

The square root of 1620351456 is about 40253.5893554848. The cubic root of 1620351456 is about 1174.5452185379.

The spelling of 1620351456 in words is "one billion, six hundred twenty million, three hundred fifty-one thousand, four hundred fifty-six".