642737479 has 8 divisors (see below), whose sum is σ = 689869440. Its totient is φ = 596641536.

The previous prime is 642737467. The next prime is 642737489. The reversal of 642737479 is 974737246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 642737479 - 2¹³ = 642729287 is a prime.

It is a super-2 number, since 2×642737479² = 826222933822550882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642737489) 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, 257719 + ... + 260200.

It is an arithmetic number, because the mean of its divisors is an integer number (86233680).

Almost surely, 2^642737479 is an apocalyptic number.

642737479 is a deficient number, since it is larger than the sum of its proper divisors (47131961).

642737479 is a wasteful number, since it uses less digits than its factorization.

642737479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518009.

The product of its digits is 1778112, while the sum is 49.

The square root of 642737479 is about 25352.2677289429. The cubic root of 642737479 is about 863.0008199403. Note that the first 3 decimals are identical.

The spelling of 642737479 in words is "six hundred forty-two million, seven hundred thirty-seven thousand, four hundred seventy-nine".