77230720 has 64 divisors (see below), whose sum is σ = 211017600. Its totient is φ = 26477568.

The previous prime is 77230717. The next prime is 77230759. The reversal of 77230720 is 2703277.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×77230720² = 11929168223436800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4140 + ... + 13099.

It is an arithmetic number, because the mean of its divisors is an integer number (3297150).

Almost surely, 2^77230720 is an apocalyptic number.

77230720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

77230720 is an abundant number, since it is smaller than the sum of its proper divisors (133786880).

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

77230720 is a wasteful number, since it uses less digits than its factorization.

77230720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17265 (or 17253 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 28.

The square root of 77230720 is about 8788.1010463012. The cubic root of 77230720 is about 425.8565792265.

Adding to 77230720 its reverse (2703277), we get a palindrome (79933997).

The spelling of 77230720 in words is "seventy-seven million, two hundred thirty thousand, seven hundred twenty".