623553240 has 128 divisors (see below), whose sum is σ = 1912896000. Its totient is φ = 162570240.

The previous prime is 623553239. The next prime is 623553283. The reversal of 623553240 is 42355326.

It is a super-2 number, since 2×623553240² = 777637286228995200, which contains 22 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 623553198 and 623553207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1388536 + ... + 1388984.

It is an arithmetic number, because the mean of its divisors is an integer number (14944500).

Almost surely, 2^623553240 is an apocalyptic number.

623553240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623553240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (956448000).

623553240 is an abundant number, since it is smaller than the sum of its proper divisors (1289342760).

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

623553240 is a wasteful number, since it uses less digits than its factorization.

623553240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 697 (or 693 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 623553240 is about 24971.0480356752. The cubic root of 623553240 is about 854.3277503643.

The spelling of 623553240 in words is "six hundred twenty-three million, five hundred fifty-three thousand, two hundred forty".