72001550 has 24 divisors (see below), whose sum is σ = 135928056. Its totient is φ = 28369440.

The previous prime is 72001543. The next prime is 72001591. The reversal of 72001550 is 5510027.

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, 7397 + ... + 14096.

It is an arithmetic number, because the mean of its divisors is an integer number (5663669).

Almost surely, 2^72001550 is an apocalyptic number.

72001550 is a deficient number, since it is larger than the sum of its proper divisors (63926506).

72001550 is a wasteful number, since it uses less digits than its factorization.

72001550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21572 (or 21567 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 20.

The square root of 72001550 is about 8485.3727083729. The cubic root of 72001550 is about 416.0197498944.

Adding to 72001550 its reverse (5510027), we get a palindrome (77511577).

It can be divided in two parts, 72001 and 550, that multiplied together give a triangular number (39600550 = T₈₈₉₉).

The spelling of 72001550 in words is "seventy-two million, one thousand, five hundred fifty".