18780552 has 64 divisors (see below), whose sum is σ = 59625600. Its totient is φ = 5365440.

The previous prime is 18780547. The next prime is 18780557. The reversal of 18780552 is 25508781.

It is an interprime number because it is at equal distance from previous prime (18780547) and next prime (18780557).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (18780557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4699 + ... + 7722.

It is an arithmetic number, because the mean of its divisors is an integer number (931650).

Almost surely, 2^18780552 is an apocalyptic number.

18780552 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18780552 is an abundant number, since it is smaller than the sum of its proper divisors (40845048).

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

18780552 is a wasteful number, since it uses less digits than its factorization.

18780552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12443 (or 12433 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18780552 is about 4333.6534240753. The cubic root of 18780552 is about 265.8088588582.

The spelling of 18780552 in words is "eighteen million, seven hundred eighty thousand, five hundred fifty-two".