1620426998400 has 768 divisors, whose sum is σ = 6608958428160. Its totient is φ = 340478853120.

The previous prime is 1620426998387. The next prime is 1620426998423. The reversal of 1620426998400 is 48996240261.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 49106707 + ... + 49139693.

It is an arithmetic number, because the mean of its divisors is an integer number (8605414620).

Almost surely, 2^{1620426998400} is an apocalyptic number.

1620426998400 is a gapful number since it is divisible by the number (10) 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 1620426998400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3304479214080).

1620426998400 is an abundant number, since it is smaller than the sum of its proper divisors (4988531429760).

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

1620426998400 is a wasteful number, since it uses less digits than its factorization.

1620426998400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33081 (or 33064 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 51.

The spelling of 1620426998400 in words is "one trillion, six hundred twenty billion, four hundred twenty-six million, nine hundred ninety-eight thousand, four hundred".