1611320640 has 56 divisors (see below), whose sum is σ = 5115946080. Its totient is φ = 429685248.

The previous prime is 1611320629. The next prime is 1611320651. The reversal of 1611320640 is 460231161.

It is an interprime number because it is at equal distance from previous prime (1611320629) and next prime (1611320651).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1611320640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 838270 + ... + 840189.

It is an arithmetic number, because the mean of its divisors is an integer number (91356180).

Almost surely, 2^1611320640 is an apocalyptic number.

1611320640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1611320640 is an abundant number, since it is smaller than the sum of its proper divisors (3504625440).

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

1611320640 is a wasteful number, since it uses less digits than its factorization.

1611320640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1678479 (or 1678469 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 1611320640 is about 40141.2585751867. The cubic root of 1611320640 is about 1172.3590943037.

The spelling of 1611320640 in words is "one billion, six hundred eleven million, three hundred twenty thousand, six hundred forty".