77251428 has 48 divisors (see below), whose sum is σ = 200979520. Its totient is φ = 25660800.

The previous prime is 77251403. The next prime is 77251429. The reversal of 77251428 is 82415277.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 77251392 and 77251401.

It is not an unprimeable number, because it can be changed into a prime (77251429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34668 + ... + 36828.

Almost surely, 2^77251428 is an apocalyptic number.

It is an amenable number.

77251428 is an abundant number, since it is smaller than the sum of its proper divisors (123728092).

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

77251428 is a wasteful number, since it uses less digits than its factorization.

77251428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2505 (or 2497 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 77251428 is about 8789.2791513298. The cubic root of 77251428 is about 425.8946377002.

The spelling of 77251428 in words is "seventy-seven million, two hundred fifty-one thousand, four hundred twenty-eight".