72403578 has 64 divisors (see below), whose sum is σ = 183496320. Its totient is φ = 20964096.

The previous prime is 72403559. The next prime is 72403601. The reversal of 72403578 is 87530427.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8901 + ... + 14967.

It is an arithmetic number, because the mean of its divisors is an integer number (2867130).

Almost surely, 2^72403578 is an apocalyptic number.

72403578 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 72403578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91748160).

72403578 is an abundant number, since it is smaller than the sum of its proper divisors (111092742).

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

72403578 is a wasteful number, since it uses less digits than its factorization.

72403578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6108 (or 6102 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 72403578 is about 8509.0292043217. The cubic root of 72403578 is about 416.7926094661.

The spelling of 72403578 in words is "seventy-two million, four hundred three thousand, five hundred seventy-eight".