72153550 has 24 divisors (see below), whose sum is σ = 153378576. Its totient is φ = 24738240.

The previous prime is 72153533. The next prime is 72153577. The reversal of 72153550 is 5535127.

It is a super-2 number, since 2×72153550² = 10412269555205000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 102727 + ... + 103426.

It is an arithmetic number, because the mean of its divisors is an integer number (6390774).

Almost surely, 2^72153550 is an apocalyptic number.

72153550 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72153550 is an abundant number, since it is smaller than the sum of its proper divisors (81225026).

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

72153550 is a wasteful number, since it uses less digits than its factorization.

72153550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206172 (or 206167 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 28.

The square root of 72153550 is about 8494.3245758565. The cubic root of 72153550 is about 416.3122924686.

Adding to 72153550 its reverse (5535127), we get a palindrome (77688677).

The spelling of 72153550 in words is "seventy-two million, one hundred fifty-three thousand, five hundred fifty".