72261618 has 32 divisors (see below), whose sum is σ = 169791552. Its totient is φ = 20212800.

The previous prime is 72261593. The next prime is 72261643. The reversal of 72261618 is 81616227.

It is an interprime number because it is at equal distance from previous prime (72261593) and next prime (72261643).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41253 + ... + 42968.

It is an arithmetic number, because the mean of its divisors is an integer number (5305986).

Almost surely, 2^72261618 is an apocalyptic number.

72261618 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

72261618 is an abundant number, since it is smaller than the sum of its proper divisors (97529934).

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

72261618 is a wasteful number, since it uses less digits than its factorization.

72261618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84250.

The product of its digits is 8064, while the sum is 33.

The square root of 72261618 is about 8500.6833842933. The cubic root of 72261618 is about 416.5200327402.

The spelling of 72261618 in words is "seventy-two million, two hundred sixty-one thousand, six hundred eighteen".