624213994 has 4 divisors (see below), whose sum is σ = 936320994. Its totient is φ = 312106996.

The previous prime is 624213983. The next prime is 624214001. The reversal of 624213994 is 499312426.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 382007025 + 242206969 = 19545^2 + 15563^2 .

It is a super-2 number, since 2×624213994² = 779286220610864072, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 156053497 + ... + 156053500.

Almost surely, 2^624213994 is an apocalyptic number.

624213994 is a deficient number, since it is larger than the sum of its proper divisors (312107000).

624213994 is a wasteful number, since it uses less digits than its factorization.

624213994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312106999.

The product of its digits is 93312, while the sum is 40.

The square root of 624213994 is about 24984.2749344463. The cubic root of 624213994 is about 854.6294092907.

The spelling of 624213994 in words is "six hundred twenty-four million, two hundred thirteen thousand, nine hundred ninety-four".