257123730 has 32 divisors (see below), whose sum is σ = 633777984. Its totient is φ = 66712896.

The previous prime is 257123717. The next prime is 257123743. The reversal of 257123730 is 37321752.

257123730 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (257123717) and next prime (257123743).

It is a super-2 number, since 2×257123730² = 132225225058225800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 114712 + ... + 116931.

It is an arithmetic number, because the mean of its divisors is an integer number (19805562).

Almost surely, 2^257123730 is an apocalyptic number.

257123730 is an abundant number, since it is smaller than the sum of its proper divisors (376654254).

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

257123730 is a wasteful number, since it uses less digits than its factorization.

257123730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231690.

The product of its (nonzero) digits is 8820, while the sum is 30.

The square root of 257123730 is about 16035.0781101933. The cubic root of 257123730 is about 635.8881324941. Note that the first 3 decimals are identical.

The spelling of 257123730 in words is "two hundred fifty-seven million, one hundred twenty-three thousand, seven hundred thirty".