123620464 has 80 divisors (see below), whose sum is σ = 280696320. Its totient is φ = 52116480.

The previous prime is 123620461. The next prime is 123620473. The reversal of 123620464 is 464026321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123620461) 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, 236107 + ... + 236629.

It is an arithmetic number, because the mean of its divisors is an integer number (3508704).

Almost surely, 2^123620464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123620464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140348160).

123620464 is an abundant number, since it is smaller than the sum of its proper divisors (157075856).

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

123620464 is a wasteful number, since it uses less digits than its factorization.

123620464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 123620464 is about 11118.4739960122. The cubic root of 123620464 is about 498.1538102234.

Adding to 123620464 its reverse (464026321), we get a palindrome (587646785).

The spelling of 123620464 in words is "one hundred twenty-three million, six hundred twenty thousand, four hundred sixty-four".