621225500 has 48 divisors (see below), whose sum is σ = 1550587584. Its totient is φ = 212990400.

The previous prime is 621225497. The next prime is 621225503. The reversal of 621225500 is 5522126.

It is an interprime number because it is at equal distance from previous prime (621225497) and next prime (621225503).

It is a super-2 number, since 2×621225500² = 771842243700500000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621225503) 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, 85247 + ... + 92246.

It is an arithmetic number, because the mean of its divisors is an integer number (32303908).

Almost surely, 2^621225500 is an apocalyptic number.

It is an amenable number.

621225500 is an abundant number, since it is smaller than the sum of its proper divisors (929362084).

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

621225500 is a wasteful number, since it uses less digits than its factorization.

621225500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177519 (or 177507 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 621225500 is about 24924.3956797351. The cubic root of 621225500 is about 853.2633490918.

Adding to 621225500 its reverse (5522126), we get a palindrome (626747626).

The spelling of 621225500 in words is "six hundred twenty-one million, two hundred twenty-five thousand, five hundred".