620757642 has 32 divisors (see below), whose sum is σ = 1250121600. Its totient is φ = 205491008.

The previous prime is 620757637. The next prime is 620757647. The reversal of 620757642 is 246757026.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (620757637) and next prime (620757647).

It is a self number, because there is not a number n which added to its sum of digits gives 620757642.

It is not an unprimeable number, because it can be changed into a prime (620757647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739459 + ... + 740297.

It is an arithmetic number, because the mean of its divisors is an integer number (39066300).

Almost surely, 2^620757642 is an apocalyptic number.

620757642 is an abundant number, since it is smaller than the sum of its proper divisors (629363958).

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

620757642 is a wasteful number, since it uses less digits than its factorization.

620757642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1550.

The product of its (nonzero) digits is 141120, while the sum is 39.

The square root of 620757642 is about 24915.0083684513. The cubic root of 620757642 is about 853.0490917662.

The spelling of 620757642 in words is "six hundred twenty million, seven hundred fifty-seven thousand, six hundred forty-two".