612731520 has 256 divisors, whose sum is σ = 2210544000. Its totient is φ = 160358400.

The previous prime is 612731503. The next prime is 612731659. The reversal of 612731520 is 25137216.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 1019220 + ... + 1019820.

Almost surely, 2^612731520 is an apocalyptic number.

612731520 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 612731520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105272000).

612731520 is an abundant number, since it is smaller than the sum of its proper divisors (1597812480).

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

612731520 is a wasteful number, since it uses less digits than its factorization.

612731520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 688 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The square root of 612731520 is about 24753.4143099492. The cubic root of 612731520 is about 849.3566157836.

Adding to 612731520 its reverse (25137216), we get a palindrome (637868736).

The spelling of 612731520 in words is "six hundred twelve million, seven hundred thirty-one thousand, five hundred twenty".