72051550 has 12 divisors (see below), whose sum is σ = 134015976. Its totient is φ = 28820600.

The previous prime is 72051541. The next prime is 72051557. The reversal of 72051550 is 5515027.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72051557) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 720466 + ... + 720565.

It is an arithmetic number, because the mean of its divisors is an integer number (11167998).

Almost surely, 2^72051550 is an apocalyptic number.

72051550 is a deficient number, since it is larger than the sum of its proper divisors (61964426).

72051550 is a wasteful number, since it uses less digits than its factorization.

72051550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1441043 (or 1441038 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 72051550 is about 8488.3184436024. The cubic root of 72051550 is about 416.1160264071.

Adding to 72051550 its reverse (5515027), we get a palindrome (77566577).

The spelling of 72051550 in words is "seventy-two million, fifty-one thousand, five hundred fifty".