77253988 has 18 divisors (see below), whose sum is σ = 157267446. Its totient is φ = 33108768.

The previous prime is 77253971. The next prime is 77254003. The reversal of 77253988 is 88935277.

It can be written as a sum of positive squares in only one way, i.e., 77053284 + 200704 = 8778^2 + 448^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 196881 + ... + 197272.

Almost surely, 2^77253988 is an apocalyptic number.

It is an amenable number.

77253988 is an abundant number, since it is smaller than the sum of its proper divisors (80013458).

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

77253988 is a wasteful number, since it uses less digits than its factorization.

77253988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394171 (or 394162 counting only the distinct ones).

The product of its digits is 846720, while the sum is 49.

The square root of 77253988 is about 8789.4247820890. The cubic root of 77253988 is about 425.8993421579.

The spelling of 77253988 in words is "seventy-seven million, two hundred fifty-three thousand, nine hundred eighty-eight".