1623464640 has 448 divisors, whose sum is σ = 6934809600. Its totient is φ = 349028352.

The previous prime is 1623464627. The next prime is 1623464663. The reversal of 1623464640 is 464643261.

1623464640 is a `hidden beast` number, since 1 + 6 + 2 + 3 + 4 + 6 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (448).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1623464595 and 1623464604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1027371 + ... + 1028949.

Almost surely, 2^1623464640 is an apocalyptic number.

1623464640 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 1623464640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3467404800).

1623464640 is an abundant number, since it is smaller than the sum of its proper divisors (5311344960).

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

1623464640 is a wasteful number, since it uses less digits than its factorization.

1623464640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629 (or 1613 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 1623464640 is about 40292.2404440359. The cubic root of 1623464640 is about 1175.2969558785.

The spelling of 1623464640 in words is "one billion, six hundred twenty-three million, four hundred sixty-four thousand, six hundred forty".