1561502404 has 36 divisors (see below), whose sum is σ = 3467756880. Its totient is φ = 608376720.

The previous prime is 1561502401. The next prime is 1561502413. The reversal of 1561502404 is 4042051651.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (1561502401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 359974 + ... + 364285.

It is an arithmetic number, because the mean of its divisors is an integer number (96326580).

Almost surely, 2^1561502404 is an apocalyptic number.

1561502404 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

1561502404 is an abundant number, since it is smaller than the sum of its proper divisors (1906254476).

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

1561502404 is a wasteful number, since it uses less digits than its factorization.

1561502404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724288 (or 724279 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 1561502404 is about 39515.8500351441. The cubic root of 1561502404 is about 1160.1501995363.

The spelling of 1561502404 in words is "one billion, five hundred sixty-one million, five hundred two thousand, four hundred four".