72391478 has 16 divisors (see below), whose sum is σ = 110418000. Its totient is φ = 35590752.

The previous prime is 72391477. The next prime is 72391513. The reversal of 72391478 is 87419327.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72391477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29108 + ... + 31496.

It is an arithmetic number, because the mean of its divisors is an integer number (6901125).

Almost surely, 2^72391478 is an apocalyptic number.

72391478 is a deficient number, since it is larger than the sum of its proper divisors (38026522).

72391478 is a wasteful number, since it uses less digits than its factorization.

72391478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2639.

The product of its digits is 84672, while the sum is 41.

The square root of 72391478 is about 8508.3181651840. The cubic root of 72391478 is about 416.7693902106.

The spelling of 72391478 in words is "seventy-two million, three hundred ninety-one thousand, four hundred seventy-eight".