157821464 has 32 divisors (see below), whose sum is σ = 305529840. Its totient is φ = 76377600.

The previous prime is 157821463. The next prime is 157821473. The reversal of 157821464 is 464128751.

It is a super-2 number, since 2×157821464² = 49815228998206592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157821463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41132 + ... + 44804.

Almost surely, 2^157821464 is an apocalyptic number.

It is an amenable number.

157821464 is a deficient number, since it is larger than the sum of its proper divisors (147708376).

157821464 is a wasteful number, since it uses less digits than its factorization.

157821464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3851 (or 3847 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 157821464 is about 12562.7013018698. The cubic root of 157821464 is about 540.4083148650.

The spelling of 157821464 in words is "one hundred fifty-seven million, eight hundred twenty-one thousand, four hundred sixty-four".