647061994 has 8 divisors (see below), whose sum is σ = 996825348. Its totient is φ = 314786880.

The previous prime is 647061983. The next prime is 647061997. The reversal of 647061994 is 499160746.

It can be written as a sum of positive squares in 2 ways, for example, as 647040969 + 21025 = 25437^2 + 145^2 .

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

It is not an unprimeable number, because it can be changed into a prime (647061997) 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, 4371967 + ... + 4372114.

Almost surely, 2^647061994 is an apocalyptic number.

647061994 is a deficient number, since it is larger than the sum of its proper divisors (349763354).

647061994 is a wasteful number, since it uses less digits than its factorization.

647061994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8744120.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 647061994 is about 25437.4132725794. The cubic root of 647061994 is about 864.9319977281.

The spelling of 647061994 in words is "six hundred forty-seven million, sixty-one thousand, nine hundred ninety-four".