649217572900 has 54 divisors (see below), whose sum is σ = 1525507675062. Its totient is φ = 239711097600.

The previous prime is 649217572811. The next prime is 649217572901. The reversal of 649217572900 is 9275712946.

It can be written as a sum of positive squares in 9 ways, for example, as 449723136996 + 199494435904 = 670614^2 + 446648^2 .

It is a Harshad number since it is a multiple of its sum of digits (52).

It is not an unprimeable number, because it can be changed into a prime (649217572901) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19190721 + ... + 19224520.

Almost surely, 2^649217572900 is an apocalyptic number.

It is an amenable number.

649217572900 is an abundant number, since it is smaller than the sum of its proper divisors (876290102162).

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

649217572900 is a wasteful number, since it uses less digits than its factorization.

649217572900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38415281 (or 38415261 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 52.

The spelling of 649217572900 in words is "six hundred forty-nine billion, two hundred seventeen million, five hundred seventy-two thousand, nine hundred".