651673332 has 18 divisors (see below), whose sum is σ = 1647285458. Its totient is φ = 217224432.

The previous prime is 651673271. The next prime is 651673339. The reversal of 651673332 is 233376156.

It can be written as a sum of positive squares in only one way, i.e., 511392996 + 140280336 = 22614^2 + 11844^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18102037 = 651673332 / (6 + 5 + 1 + 6 + 7 + 3 + 3 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (651673339) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9050983 + ... + 9051054.

Almost surely, 2^651673332 is an apocalyptic number.

It is an amenable number.

651673332 is an abundant number, since it is smaller than the sum of its proper divisors (995612126).

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

651673332 is a wasteful number, since it uses less digits than its factorization.

651673332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18102047 (or 18102042 counting only the distinct ones).

The product of its digits is 68040, while the sum is 36.

The square root of 651673332 is about 25527.8932150697. The cubic root of 651673332 is about 866.9818045933.

The spelling of 651673332 in words is "six hundred fifty-one million, six hundred seventy-three thousand, three hundred thirty-two".