72301530 has 32 divisors (see below), whose sum is σ = 198313344. Its totient is φ = 16526016.

The previous prime is 72301529. The next prime is 72301547. The reversal of 72301530 is 3510327.

It is a happy number.

It is a super-2 number, since 2×72301530² = 10455022480681800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 72301497 and 72301506.

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, 171937 + ... + 172356.

It is an arithmetic number, because the mean of its divisors is an integer number (6197292).

Almost surely, 2^72301530 is an apocalyptic number.

72301530 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72301530 is an abundant number, since it is smaller than the sum of its proper divisors (126011814).

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

72301530 is a wasteful number, since it uses less digits than its factorization.

72301530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344310.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 72301530 is about 8503.0306361908. The cubic root of 72301530 is about 416.5967036309.

Adding to 72301530 its reverse (3510327), we get a palindrome (75811857).

The spelling of 72301530 in words is "seventy-two million, three hundred one thousand, five hundred thirty".