72551655 has 48 divisors (see below), whose sum is σ = 138617856. Its totient is φ = 34810560.

The previous prime is 72551653. The next prime is 72551657. The reversal of 72551655 is 55615527.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (72551653) and next prime (72551657).

It is not a de Polignac number, because 72551655 - 2¹ = 72551653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72551653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 50274 + ... + 51696.

It is an arithmetic number, because the mean of its divisors is an integer number (2887872).

Almost surely, 2^72551655 is an apocalyptic number.

72551655 is a deficient number, since it is larger than the sum of its proper divisors (66066201).

72551655 is a wasteful number, since it uses less digits than its factorization.

72551655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1545 counting only the distinct ones).

The product of its digits is 52500, while the sum is 36.

The square root of 72551655 is about 8517.7259289085. The cubic root of 72551655 is about 417.0765520311.

The spelling of 72551655 in words is "seventy-two million, five hundred fifty-one thousand, six hundred fifty-five".