71220720 has 40 divisors (see below), whose sum is σ = 220784976. Its totient is φ = 18992128.

The previous prime is 71220713. The next prime is 71220727. The reversal of 71220720 is 2702217.

It is an interprime number because it is at equal distance from previous prime (71220713) and next prime (71220727).

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71220727) 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, 148137 + ... + 148616.

Almost surely, 2^71220720 is an apocalyptic number.

It is an amenable number.

71220720 is an abundant number, since it is smaller than the sum of its proper divisors (149564256).

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

71220720 is a wasteful number, since it uses less digits than its factorization.

71220720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296769 (or 296763 counting only the distinct ones).

The product of its (nonzero) digits is 392, while the sum is 21.

The square root of 71220720 is about 8439.2369323298. The cubic root of 71220720 is about 414.5104208761.

Adding to 71220720 its reverse (2702217), we get a palindrome (73922937).

The spelling of 71220720 in words is "seventy-one million, two hundred twenty thousand, seven hundred twenty".