77025520 has 80 divisors (see below), whose sum is σ = 210424032. Its totient is φ = 25850880.

The previous prime is 77025499. The next prime is 77025541. The reversal of 77025520 is 2552077.

It is an interprime number because it is at equal distance from previous prime (77025499) and next prime (77025541).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8074 + ... + 14806.

Almost surely, 2^77025520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77025520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105212016).

77025520 is an abundant number, since it is smaller than the sum of its proper divisors (133398512).

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

77025520 is a wasteful number, since it uses less digits than its factorization.

77025520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6770 (or 6764 counting only the distinct ones).

The product of its (nonzero) digits is 4900, while the sum is 28.

The square root of 77025520 is about 8776.4184038821. The cubic root of 77025520 is about 425.4790814363.

Adding to 77025520 its reverse (2552077), we get a palindrome (79577597).

The spelling of 77025520 in words is "seventy-seven million, twenty-five thousand, five hundred twenty".