1652721804 has 18 divisors (see below), whose sum is σ = 4177713540. Its totient is φ = 550907256.

The previous prime is 1652721797. The next prime is 1652721823. The reversal of 1652721804 is 4081272561.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1652721804² = 5462978722834028832, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 45908939 = 1652721804 / (1 + 6 + 5 + 2 + 7 + 2 + 1 + 8 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22954434 + ... + 22954505.

Almost surely, 2^1652721804 is an apocalyptic number.

It is an amenable number.

1652721804 is an abundant number, since it is smaller than the sum of its proper divisors (2524991736).

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

1652721804 is a wasteful number, since it uses less digits than its factorization.

1652721804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45908949 (or 45908944 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1652721804 is about 40653.6813093230. The cubic root of 1652721804 is about 1182.3151435368.

The spelling of 1652721804 in words is "one billion, six hundred fifty-two million, seven hundred twenty-one thousand, eight hundred four".