71620399 has 8 divisors (see below), whose sum is σ = 73563840. Its totient is φ = 69686400.

The previous prime is 71620379. The next prime is 71620403. The reversal of 71620399 is 99302617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71620399 - 2⁹ = 71619887 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71620349) 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, 14634 + ... + 18904.

It is an arithmetic number, because the mean of its divisors is an integer number (9195480).

Almost surely, 2^71620399 is an apocalyptic number.

71620399 is a deficient number, since it is larger than the sum of its proper divisors (1943441).

71620399 is a wasteful number, since it uses less digits than its factorization.

71620399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4721.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 71620399 is about 8462.8836102123. The cubic root of 71620399 is about 415.2843630974.

It can be divided in two parts, 716 and 20399, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 71620399 in words is "seventy-one million, six hundred twenty thousand, three hundred ninety-nine".