621772 has 6 divisors (see below), whose sum is σ = 1088108. Its totient is φ = 310884.

The previous prime is 621769. The next prime is 621779. The reversal of 621772 is 277126.

It is not an unprimeable number, because it can be changed into a prime (621779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77718 + ... + 77725.

2⁶²¹⁷⁷² is an apocalyptic number.

It is an amenable number.

621772 is a deficient number, since it is larger than the sum of its proper divisors (466336).

621772 is a wasteful number, since it uses less digits than its factorization.

621772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155447 (or 155445 counting only the distinct ones).

The product of its digits is 1176, while the sum is 25.

The square root of 621772 is about 788.5252056846. The cubic root of 621772 is about 85.3513484643.

Adding to 621772 its reverse (277126), we get a palindrome (898898).

The spelling of 621772 in words is "six hundred twenty-one thousand, seven hundred seventy-two".