52780440 has 64 divisors (see below), whose sum is σ = 158824800. Its totient is φ = 14031872.

The previous prime is 52780391. The next prime is 52780457. The reversal of 52780440 is 4408725.

52780440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 52780398 and 52780407.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 67894 + ... + 68666.

Almost surely, 2^52780440 is an apocalyptic number.

It is an amenable number.

52780440 is an abundant number, since it is smaller than the sum of its proper divisors (106044360).

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

52780440 is a wasteful number, since it uses less digits than its factorization.

52780440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356 (or 1352 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 52780440 is about 7265.0147969567. The cubic root of 52780440 is about 375.1091593327.

The spelling of 52780440 in words is "fifty-two million, seven hundred eighty thousand, four hundred forty".