72155930 has 72 divisors (see below), whose sum is σ = 166205844. Its totient is φ = 22471680.

The previous prime is 72155927. The next prime is 72155933. The reversal of 72155930 is 3955127.

It is an interprime number because it is at equal distance from previous prime (72155927) and next prime (72155933).

It can be written as a sum of positive squares in 2 ways, for example, as 70442449 + 1713481 = 8393^2 + 1309^2 .

It is not an unprimeable number, because it can be changed into a prime (72155933) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 58682 + ... + 59898.

Almost surely, 2^72155930 is an apocalyptic number.

72155930 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

72155930 is an abundant number, since it is smaller than the sum of its proper divisors (94049914).

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

72155930 is a wasteful number, since it uses less digits than its factorization.

72155930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1260 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 72155930 is about 8494.4646682413. The cubic root of 72155930 is about 416.3168698011.

The spelling of 72155930 in words is "seventy-two million, one hundred fifty-five thousand, nine hundred thirty".