647226442 has 4 divisors (see below), whose sum is σ = 970839666. Its totient is φ = 323613220.

The previous prime is 647226421. The next prime is 647226443. The reversal of 647226442 is 244622746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 594823321 + 52403121 = 24389^2 + 7239^2 .

It is not an unprimeable number, because it can be changed into a prime (647226443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161806609 + ... + 161806612.

Almost surely, 2^647226442 is an apocalyptic number.

647226442 is a deficient number, since it is larger than the sum of its proper divisors (323613224).

647226442 is a wasteful number, since it uses less digits than its factorization.

647226442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323613223.

The product of its digits is 129024, while the sum is 37.

The square root of 647226442 is about 25440.6454713712. The cubic root of 647226442 is about 865.0052644272.

The spelling of 647226442 in words is "six hundred forty-seven million, two hundred twenty-six thousand, four hundred forty-two".