15780052 has 6 divisors (see below), whose sum is σ = 27615098. Its totient is φ = 7890024.

The previous prime is 15780049. The next prime is 15780067. The reversal of 15780052 is 25008751.

It can be written as a sum of positive squares in only one way, i.e., 13571856 + 2208196 = 3684^2 + 1486^2 .

It is a super-2 number, since 2×15780052² = 498020082245408, 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 15780052.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972503 + ... + 1972510.

Almost surely, 2^15780052 is an apocalyptic number.

It is an amenable number.

15780052 is a deficient number, since it is larger than the sum of its proper divisors (11835046).

15780052 is a wasteful number, since it uses less digits than its factorization.

15780052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945017 (or 3945015 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 15780052 is about 3972.4113583565. The cubic root of 15780052 is about 250.8242236353.

The spelling of 15780052 in words is "fifteen million, seven hundred eighty thousand, fifty-two".