751225428 has 30 divisors (see below), whose sum is σ = 1963852506. Its totient is φ = 250408368.

The previous prime is 751225421. The next prime is 751225441. The reversal of 751225428 is 824522157.

It is a happy number.

751225428 is a `hidden beast` number, since 7 + 5 + 1 + 225 + 428 = 666.

It can be written as a sum of positive squares in only one way, i.e., 747584964 + 3640464 = 27342^2 + 1908^2 .

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 = 751225392 and 751225401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (751225421) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1158975 + ... + 1159622.

Almost surely, 2^751225428 is an apocalyptic number.

It is an amenable number.

751225428 is an abundant number, since it is smaller than the sum of its proper divisors (1212627078).

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

751225428 is a wasteful number, since it uses less digits than its factorization.

751225428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2318613 (or 2318602 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 751225428 is about 27408.4918957611. The cubic root of 751225428 is about 909.0548605912.

The spelling of 751225428 in words is "seven hundred fifty-one million, two hundred twenty-five thousand, four hundred twenty-eight".