621141780 has 48 divisors (see below), whose sum is σ = 1987655040. Its totient is φ = 141975168.

The previous prime is 621141779. The next prime is 621141799. The reversal of 621141780 is 87141126.

It is a super-2 number, since 2×621141780² = 771634221723136800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739035 + ... + 739874.

It is an arithmetic number, because the mean of its divisors is an integer number (41409480).

Almost surely, 2^621141780 is an apocalyptic number.

621141780 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

621141780 is an abundant number, since it is smaller than the sum of its proper divisors (1366513260).

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

621141780 is a wasteful number, since it uses less digits than its factorization.

621141780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1478928 (or 1478926 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 621141780 is about 24922.7161441124. The cubic root of 621141780 is about 853.2250171083.

The spelling of 621141780 in words is "six hundred twenty-one million, one hundred forty-one thousand, seven hundred eighty".