4531157820 has 216 divisors, whose sum is σ = 16314645984. Its totient is φ = 1035483264.

The previous prime is 4531157819. The next prime is 4531157843. The reversal of 4531157820 is 287511354.

4531157820 is a `hidden beast` number, since 4 + 53 + 11 + 578 + 20 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 916074 + ... + 921006.

Almost surely, 2^4531157820 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4531157820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8157322992).

4531157820 is an abundant number, since it is smaller than the sum of its proper divisors (11783488164).

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

4531157820 is an equidigital number, since it uses as much as digits as its factorization.

4531157820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4973 (or 4950 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 36.

The square root of 4531157820 is about 67313.8753898481. The cubic root of 4531157820 is about 1654.7652657960.

The spelling of 4531157820 in words is "four billion, five hundred thirty-one million, one hundred fifty-seven thousand, eight hundred twenty".