621549677 has 8 divisors (see below), whose sum is σ = 741227136. Its totient is φ = 509593392.

The previous prime is 621549653. The next prime is 621549703. The reversal of 621549677 is 776945126.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 621549677 - 2⁶ = 621549613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621549647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1930118 + ... + 1930439.

It is an arithmetic number, because the mean of its divisors is an integer number (92653392).

Almost surely, 2^621549677 is an apocalyptic number.

It is an amenable number.

621549677 is a deficient number, since it is larger than the sum of its proper divisors (119677459).

621549677 is a wasteful number, since it uses less digits than its factorization.

621549677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860587.

The product of its digits is 635040, while the sum is 47.

The square root of 621549677 is about 24930.8980383780. The cubic root of 621549677 is about 853.4117440799.

It can be divided in two parts, 621549 and 677, that added together give a palindrome (622226).

The spelling of 621549677 in words is "six hundred twenty-one million, five hundred forty-nine thousand, six hundred seventy-seven".