51497644 has 48 divisors (see below), whose sum is σ = 103574016. Its totient is φ = 22176000.

The previous prime is 51497639. The next prime is 51497647. The reversal of 51497644 is 44679415.

It is a junction number, because it is equal to n+sod(n) for n = 51497597 and 51497606.

It is not an unprimeable number, because it can be changed into a prime (51497647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152644 + ... + 152980.

It is an arithmetic number, because the mean of its divisors is an integer number (2157792).

Almost surely, 2^51497644 is an apocalyptic number.

It is an amenable number.

51497644 is an abundant number, since it is smaller than the sum of its proper divisors (52076372).

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

51497644 is a wasteful number, since it uses less digits than its factorization.

51497644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 526 (or 524 counting only the distinct ones).

The product of its digits is 120960, while the sum is 40.

The square root of 51497644 is about 7176.1858950281. The cubic root of 51497644 is about 372.0452694745.

The spelling of 51497644 in words is "fifty-one million, four hundred ninety-seven thousand, six hundred forty-four".