1621062144 has 120 divisors (see below), whose sum is σ = 5038565532. Its totient is φ = 498769920.

The previous prime is 1621062143. The next prime is 1621062173. The reversal of 1621062144 is 4412601261.

1621062144 is a `hidden beast` number, since 16 + 21 + 0 + 621 + 4 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1362495744 + 258566400 = 36912^2 + 16080^2 .

It is not an unprimeable number, because it can be changed into a prime (1621062143) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 46374 + ... + 73434.

Almost surely, 2^1621062144 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1621062144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2519282766).

1621062144 is an abundant number, since it is smaller than the sum of its proper divisors (3417503388).

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

1621062144 is a wasteful number, since it uses less digits than its factorization.

1621062144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27098 (or 27079 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 1621062144 is about 40262.4160228867. The cubic root of 1621062144 is about 1174.7169123970.

The spelling of 1621062144 in words is "one billion, six hundred twenty-one million, sixty-two thousand, one hundred forty-four".