612819640 has 16 divisors (see below), whose sum is σ = 1378844280. Its totient is φ = 245127840.

The previous prime is 612819631. The next prime is 612819643. The reversal of 612819640 is 46918216.

It is a happy number.

It is a super-2 number, since 2×612819640² = 751095822339459200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 612819640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612819643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7660206 + ... + 7660285.

Almost surely, 2^612819640 is an apocalyptic number.

It is an amenable number.

612819640 is an abundant number, since it is smaller than the sum of its proper divisors (766024640).

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

612819640 is a wasteful number, since it uses less digits than its factorization.

612819640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15320502 (or 15320498 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 612819640 is about 24755.1942024295. The cubic root of 612819640 is about 849.3973305801.

The spelling of 612819640 in words is "six hundred twelve million, eight hundred nineteen thousand, six hundred forty".