1642013640 has 256 divisors, whose sum is σ = 5728320000. Its totient is φ = 417844224.

The previous prime is 1642013623. The next prime is 1642013641. The reversal of 1642013640 is 463102461.

1642013640 is a `hidden beast` number, since 1 + 6 + 4 + 2 + 0 + 13 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1642013641) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3225706 + ... + 3226214.

It is an arithmetic number, because the mean of its divisors is an integer number (22376250).

Almost surely, 2^1642013640 is an apocalyptic number.

1642013640 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 1642013640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864160000).

1642013640 is an abundant number, since it is smaller than the sum of its proper divisors (4086306360).

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

1642013640 is a wasteful number, since it uses less digits than its factorization.

1642013640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 1642013640 is about 40521.7674836624. The cubic root of 1642013640 is about 1179.7561595166.

The spelling of 1642013640 in words is "one billion, six hundred forty-two million, thirteen thousand, six hundred forty".