815620530 has 32 divisors (see below), whose sum is σ = 1958246784. Its totient is φ = 217414656.

The previous prime is 815620529. The next prime is 815620537. The reversal of 815620530 is 35026518.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (815620537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134034 + ... + 139986.

It is an arithmetic number, because the mean of its divisors is an integer number (61195212).

Almost surely, 2^815620530 is an apocalyptic number.

815620530 is an abundant number, since it is smaller than the sum of its proper divisors (1142626254).

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

815620530 is a wasteful number, since it uses less digits than its factorization.

815620530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10530.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 815620530 is about 28559.0708882484. The cubic root of 815620530 is about 934.3208695688.

The spelling of 815620530 in words is "eight hundred fifteen million, six hundred twenty thousand, five hundred thirty".