625778420 has 24 divisors (see below), whose sum is σ = 1338931944. Its totient is φ = 245588096.

The previous prime is 625778407. The next prime is 625778423. The reversal of 625778420 is 24877526.

It can be written as a sum of positive squares in 4 ways, for example, as 253828624 + 371949796 = 15932^2 + 19286^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (625778423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294119 + ... + 296238.

It is an arithmetic number, because the mean of its divisors is an integer number (55788831).

Almost surely, 2^625778420 is an apocalyptic number.

It is an amenable number.

625778420 is an abundant number, since it is smaller than the sum of its proper divisors (713153524).

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

625778420 is a wasteful number, since it uses less digits than its factorization.

625778420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590419 (or 590417 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 625778420 is about 25015.5635555148. The cubic root of 625778420 is about 855.3427806053.

The spelling of 625778420 in words is "six hundred twenty-five million, seven hundred seventy-eight thousand, four hundred twenty".