72734920 has 16 divisors (see below), whose sum is σ = 163653660. Its totient is φ = 29093952.

The previous prime is 72734917. The next prime is 72734923. The reversal of 72734920 is 2943727.

It is an interprime number because it is at equal distance from previous prime (72734917) and next prime (72734923).

It can be written as a sum of positive squares in 2 ways, for example, as 65901924 + 6832996 = 8118^2 + 2614^2 .

It is not an unprimeable number, because it can be changed into a prime (72734923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 909147 + ... + 909226.

Almost surely, 2^72734920 is an apocalyptic number.

It is an amenable number.

72734920 is an abundant number, since it is smaller than the sum of its proper divisors (90918740).

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

72734920 is a wasteful number, since it uses less digits than its factorization.

72734920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1818384 (or 1818380 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 34.

The square root of 72734920 is about 8528.4770035452. The cubic root of 72734920 is about 417.4274342907.

The spelling of 72734920 in words is "seventy-two million, seven hundred thirty-four thousand, nine hundred twenty".