1616245640 has 32 divisors (see below), whose sum is σ = 3827952000. Its totient is φ = 612471744.

The previous prime is 1616245639. The next prime is 1616245649. The reversal of 1616245640 is 465426161.

It is a super-2 number, since 2×1616245640² = 5224499937638019200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1616245640.

It is not an unprimeable number, because it can be changed into a prime (1616245649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1062560 + ... + 1064079.

It is an arithmetic number, because the mean of its divisors is an integer number (119623500).

Almost surely, 2^1616245640 is an apocalyptic number.

1616245640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1616245640 is an abundant number, since it is smaller than the sum of its proper divisors (2211706360).

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

1616245640 is a wasteful number, since it uses less digits than its factorization.

1616245640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126669 (or 2126665 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 1616245640 is about 40202.5576300812. The cubic root of 1616245640 is about 1173.5523175842.

The spelling of 1616245640 in words is "one billion, six hundred sixteen million, two hundred forty-five thousand, six hundred forty".