51671970 has 72 divisors (see below), whose sum is σ = 156294684. Its totient is φ = 11809728.

The previous prime is 51671969. The next prime is 51671981. The reversal of 51671970 is 7917615.

51671970 is a `hidden beast` number, since 516 + 71 + 9 + 70 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 42653961 + 9018009 = 6531^2 + 3003^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1449 + ... + 10268.

Almost surely, 2^51671970 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51671970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78147342).

51671970 is an abundant number, since it is smaller than the sum of its proper divisors (104622714).

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

51671970 is a wasteful number, since it uses less digits than its factorization.

51671970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11744 (or 11734 counting only the distinct ones).

The product of its (nonzero) digits is 13230, while the sum is 36.

The square root of 51671970 is about 7188.3217791081. The cubic root of 51671970 is about 372.4646033360.

The spelling of 51671970 in words is "fifty-one million, six hundred seventy-one thousand, nine hundred seventy".