649995026 has 8 divisors (see below), whose sum is σ = 976035900. Its totient is φ = 324649728.

The previous prime is 649995023. The next prime is 649995029. The reversal of 649995026 is 620599946.

It is a Cunningham number, because it is equal to 25495²+1.

It is an interprime number because it is at equal distance from previous prime (649995023) and next prime (649995029).

It can be written as a sum of positive squares in 2 ways, for example, as 649995025 + 1 = 25495^2 + 1^2 .

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 (649995023) 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, 171551 + ... + 175298.

Almost surely, 2^649995026 is an apocalyptic number.

649995026 is a deficient number, since it is larger than the sum of its proper divisors (326040874).

649995026 is a wasteful number, since it uses less digits than its factorization.

649995026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347788.

The product of its (nonzero) digits is 1049760, while the sum is 50.

The square root of 649995026 is about 25495.0000196117. Note that the first 4 decimals coincide. The cubic root of 649995026 is about 866.2368957592.

The spelling of 649995026 in words is "six hundred forty-nine million, nine hundred ninety-five thousand, twenty-six".