1601253720 has 96 divisors (see below), whose sum is σ = 5677186320. Its totient is φ = 388181760.

The previous prime is 1601253707. The next prime is 1601253733. The reversal of 1601253720 is 273521061.

It is a happy number.

1601253720 is a `hidden beast` number, since 1 + 601 + 2 + 5 + 37 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (1601253707) and next prime (1601253733).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 198219 + ... + 206138.

Almost surely, 2^1601253720 is an apocalyptic number.

1601253720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1601253720 is an abundant number, since it is smaller than the sum of its proper divisors (4075932600).

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

1601253720 is a wasteful number, since it uses less digits than its factorization.

1601253720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404385 (or 404378 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 1601253720 is about 40015.6684312533. The cubic root of 1601253720 is about 1169.9125071546.

Adding to 1601253720 its reverse (273521061), we get a palindrome (1874774781).

The spelling of 1601253720 in words is "one billion, six hundred one million, two hundred fifty-three thousand, seven hundred twenty".