621788741 has 4 divisors (see below), whose sum is σ = 710615712. Its totient is φ = 532961772.

The previous prime is 621788711. The next prime is 621788767. The reversal of 621788741 is 147887126.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 147887126 = 2 ⋅73943563.

It is not a de Polignac number, because 621788741 - 2²² = 617594437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621788692 and 621788701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621788701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44413475 + ... + 44413488.

It is an arithmetic number, because the mean of its divisors is an integer number (177653928).

Almost surely, 2^621788741 is an apocalyptic number.

It is an amenable number.

621788741 is a deficient number, since it is larger than the sum of its proper divisors (88826971).

621788741 is an equidigital number, since it uses as much as digits as its factorization.

621788741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88826970.

The product of its digits is 150528, while the sum is 44.

The square root of 621788741 is about 24935.6921099054. The cubic root of 621788741 is about 853.5211447608.

The spelling of 621788741 in words is "six hundred twenty-one million, seven hundred eighty-eight thousand, seven hundred forty-one".