612640429 has 4 divisors (see below), whose sum is σ = 621784384. Its totient is φ = 603496476.

The previous prime is 612640423. The next prime is 612640451. The reversal of 612640429 is 924046216.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 612640429 - 2¹⁵ = 612607661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 612640394 and 612640403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612640423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4571877 + ... + 4572010.

It is an arithmetic number, because the mean of its divisors is an integer number (155446096).

Almost surely, 2^612640429 is an apocalyptic number.

It is an amenable number.

612640429 is a deficient number, since it is larger than the sum of its proper divisors (9143955).

612640429 is an equidigital number, since it uses as much as digits as its factorization.

612640429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9143954.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 612640429 is about 24751.5742731649. The cubic root of 612640429 is about 849.3145241686.

The spelling of 612640429 in words is "six hundred twelve million, six hundred forty thousand, four hundred twenty-nine".