612780040 has 32 divisors (see below), whose sum is σ = 1392977880. Its totient is φ = 242583552.

The previous prime is 612780019. The next prime is 612780043. The reversal of 612780040 is 40087216.

It can be written as a sum of positive squares in 4 ways, for example, as 600544036 + 12236004 = 24506^2 + 3498^2 .

It is a junction number, because it is equal to n+sod(n) for n = 612779990 and 612780008.

It is not an unprimeable number, because it can be changed into a prime (612780043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75087 + ... + 82846.

Almost surely, 2^612780040 is an apocalyptic number.

It is an amenable number.

612780040 is an abundant number, since it is smaller than the sum of its proper divisors (780197840).

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

612780040 is a wasteful number, since it uses less digits than its factorization.

612780040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158041 (or 158037 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 612780040 is about 24754.3943573661. The cubic root of 612780040 is about 849.3790343546.

The spelling of 612780040 in words is "six hundred twelve million, seven hundred eighty thousand, forty".