72071397 has 32 divisors (see below), whose sum is σ = 114048000. Its totient is φ = 44873136.

The previous prime is 72071393. The next prime is 72071401. The reversal of 72071397 is 79317027.

It is an interprime number because it is at equal distance from previous prime (72071393) and next prime (72071401).

It is not a de Polignac number, because 72071397 - 2² = 72071393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72071393) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25354 + ... + 28052.

It is an arithmetic number, because the mean of its divisors is an integer number (3564000).

Almost surely, 2^72071397 is an apocalyptic number.

It is an amenable number.

72071397 is a deficient number, since it is larger than the sum of its proper divisors (41976603).

72071397 is a wasteful number, since it uses less digits than its factorization.

72071397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2774 (or 2768 counting only the distinct ones).

The product of its (nonzero) digits is 18522, while the sum is 36.

The square root of 72071397 is about 8489.4874403582. The cubic root of 72071397 is about 416.1542300571.

The spelling of 72071397 in words is "seventy-two million, seventy-one thousand, three hundred ninety-seven".