651551472 has 320 divisors, whose sum is σ = 2249856000. Its totient is φ = 177914880.

The previous prime is 651551443. The next prime is 651551489. The reversal of 651551472 is 274155156.

651551472 is a `hidden beast` number, since 65 + 1 + 551 + 47 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3274029 + ... + 3274227.

It is an arithmetic number, because the mean of its divisors is an integer number (7030800).

Almost surely, 2^651551472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 651551472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1124928000).

651551472 is an abundant number, since it is smaller than the sum of its proper divisors (1598304528).

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

651551472 is a wasteful number, since it uses less digits than its factorization.

651551472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 293 (or 281 counting only the distinct ones).

The product of its digits is 42000, while the sum is 36.

The square root of 651551472 is about 25525.5063025202. The cubic root of 651551472 is about 866.9277606506.

The spelling of 651551472 in words is "six hundred fifty-one million, five hundred fifty-one thousand, four hundred seventy-two".