634621620 has 48 divisors (see below), whose sum is σ = 1796921280. Its totient is φ = 167329536.

The previous prime is 634621619. The next prime is 634621621. The reversal of 634621620 is 26126436.

It is an interprime number because it is at equal distance from previous prime (634621619) and next prime (634621621).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634621621) 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, 54082 + ... + 64761.

It is an arithmetic number, because the mean of its divisors is an integer number (37435860).

Almost surely, 2^634621620 is an apocalyptic number.

634621620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

634621620 is an abundant number, since it is smaller than the sum of its proper divisors (1162299660).

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

634621620 is a wasteful number, since it uses less digits than its factorization.

634621620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118944 (or 118942 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 634621620 is about 25191.6974418160. The cubic root of 634621620 is about 859.3530468794.

It can be divided in two parts, 6346 and 21620, that added together give a triangular number (27966 = T₂₃₆).

The spelling of 634621620 in words is "six hundred thirty-four million, six hundred twenty-one thousand, six hundred twenty".