72163554 has 16 divisors (see below), whose sum is σ = 144866880. Its totient is φ = 23964560.

The previous prime is 72163547. The next prime is 72163561. The reversal of 72163554 is 45536127.

It is an interprime number because it is at equal distance from previous prime (72163547) and next prime (72163561).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20742 + ... + 23969.

It is an arithmetic number, because the mean of its divisors is an integer number (9054180).

Almost surely, 2^72163554 is an apocalyptic number.

72163554 is an abundant number, since it is smaller than the sum of its proper divisors (72703326).

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

72163554 is a wasteful number, since it uses less digits than its factorization.

72163554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44985.

The product of its digits is 25200, while the sum is 33.

The square root of 72163554 is about 8494.9134192174. The cubic root of 72163554 is about 416.3315319734.

The spelling of 72163554 in words is "seventy-two million, one hundred sixty-three thousand, five hundred fifty-four".