1780155252 has 96 divisors (see below), whose sum is σ = 4688288640. Its totient is φ = 584064000.

The previous prime is 1780155233. The next prime is 1780155263. The reversal of 1780155252 is 2525510871.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2629138 + ... + 2629814.

It is an arithmetic number, because the mean of its divisors is an integer number (48836340).

Almost surely, 2^1780155252 is an apocalyptic number.

1780155252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1780155252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2344144320).

1780155252 is an abundant number, since it is smaller than the sum of its proper divisors (2908133388).

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

1780155252 is a wasteful number, since it uses less digits than its factorization.

1780155252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038 (or 1030 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The square root of 1780155252 is about 42191.8860919964. The cubic root of 1780155252 is about 1211.9535076764.

The spelling of 1780155252 in words is "one billion, seven hundred eighty million, one hundred fifty-five thousand, two hundred fifty-two".