257601996 has 18 divisors (see below), whose sum is σ = 651160692. Its totient is φ = 85867320.

The previous prime is 257601991. The next prime is 257601997. The reversal of 257601996 is 699106752.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (257601991) 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, 3577770 + ... + 3577841.

It is an arithmetic number, because the mean of its divisors is an integer number (36175594).

Almost surely, 2^257601996 is an apocalyptic number.

It is an amenable number.

257601996 is an abundant number, since it is smaller than the sum of its proper divisors (393558696).

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

257601996 is a wasteful number, since it uses less digits than its factorization.

257601996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7155621 (or 7155616 counting only the distinct ones).

The product of its (nonzero) digits is 204120, while the sum is 45.

The square root of 257601996 is about 16049.9842990577. The cubic root of 257601996 is about 636.2821520131.

It can be divided in two parts, 257 and 601996, that added together give a triangular number (602253 = T₁₀₉₇).

The spelling of 257601996 in words is "two hundred fifty-seven million, six hundred one thousand, nine hundred ninety-six".