624990 has 32 divisors (see below), whose sum is σ = 1524096. Its totient is φ = 164000.

The previous prime is 624983. The next prime is 624997. The reversal of 624990 is 99426.

624990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (624983) and next prime (624997).

It is a super-2 number, since 2×624990² = 781225000200, which contains 22 as substring.

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 (624997) 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, 2365 + ... + 2615.

It is an arithmetic number, because the mean of its divisors is an integer number (47628).

2⁶²⁴⁹⁹⁰ is an apocalyptic number.

624990 is an abundant number, since it is smaller than the sum of its proper divisors (899106).

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

624990 is a wasteful number, since it uses less digits than its factorization.

624990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 624990 is about 790.5630904615. The cubic root of 624990 is about 85.4983413378.

The spelling of 624990 in words is "six hundred twenty-four thousand, nine hundred ninety".