1225625640 has 64 divisors (see below), whose sum is σ = 3731780160. Its totient is φ = 321953280.

The previous prime is 1225625551. The next prime is 1225625657. The reversal of 1225625640 is 465265221.

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, 68181 + ... + 84260.

It is an arithmetic number, because the mean of its divisors is an integer number (58309065).

Almost surely, 2^1225625640 is an apocalyptic number.

1225625640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225625640 is an abundant number, since it is smaller than the sum of its proper divisors (2506154520).

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

1225625640 is a wasteful number, since it uses less digits than its factorization.

1225625640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152522 (or 152518 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

The square root of 1225625640 is about 35008.9365733951. The cubic root of 1225625640 is about 1070.1696065610.

The spelling of 1225625640 in words is "one billion, two hundred twenty-five million, six hundred twenty-five thousand, six hundred forty".