1573661020 has 12 divisors (see below), whose sum is σ = 3304688184. Its totient is φ = 629464400.

The previous prime is 1573660987. The next prime is 1573661021. The reversal of 1573661020 is 201663751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1573661021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39341506 + ... + 39341545.

It is an arithmetic number, because the mean of its divisors is an integer number (275390682).

Almost surely, 2^1573661020 is an apocalyptic number.

1573661020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1573661020 is an abundant number, since it is smaller than the sum of its proper divisors (1731027164).

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

1573661020 is a wasteful number, since it uses less digits than its factorization.

1573661020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78683060 (or 78683058 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 1573661020 is about 39669.3965167105. The cubic root of 1573661020 is about 1163.1535819860.

The spelling of 1573661020 in words is "one billion, five hundred seventy-three million, six hundred sixty-one thousand, twenty".