257146979628 has 48 divisors (see below), whose sum is σ = 748063943424. Its totient is φ = 66791423040.

The previous prime is 257146979581. The next prime is 257146979729. The reversal of 257146979628 is 826979641752.

It is a happy number.

It is a super-2 number, since 2×257146979628² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139147875 + ... + 139149722.

It is an arithmetic number, because the mean of its divisors is an integer number (15584665488).

Almost surely, 2^257146979628 is an apocalyptic number.

257146979628 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

257146979628 is an abundant number, since it is smaller than the sum of its proper divisors (490916963796).

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

257146979628 is a wasteful number, since it uses less digits than its factorization.

257146979628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278297622 (or 278297620 counting only the distinct ones).

The product of its digits is 91445760, while the sum is 66.

The spelling of 257146979628 in words is "two hundred fifty-seven billion, one hundred forty-six million, nine hundred seventy-nine thousand, six hundred twenty-eight".