51245964 has 216 divisors, whose sum is σ = 174283200. Its totient is φ = 12519360.

The previous prime is 51245963. The next prime is 51245969. The reversal of 51245964 is 46954215.

It is a super-2 number, since 2×51245964² = 5252297652578592, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (51245963) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 368607 + ... + 368745.

Almost surely, 2^51245964 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 51245964, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87141600).

51245964 is an abundant number, since it is smaller than the sum of its proper divisors (123037236).

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

51245964 is a wasteful number, since it uses less digits than its factorization.

51245964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193 (or 181 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 51245964 is about 7158.6286396209. The cubic root of 51245964 is about 371.4381911569.

The spelling of 51245964 in words is "fifty-one million, two hundred forty-five thousand, nine hundred sixty-four".