1257616220 has 24 divisors (see below), whose sum is σ = 3018279264. Its totient is φ = 431182656.

The previous prime is 1257616219. The next prime is 1257616229. The reversal of 1257616220 is 226167521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1257616229) 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, 4491347 + ... + 4491626.

It is an arithmetic number, because the mean of its divisors is an integer number (125761636).

Almost surely, 2^1257616220 is an apocalyptic number.

1257616220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1257616220 is an abundant number, since it is smaller than the sum of its proper divisors (1760663044).

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

1257616220 is a wasteful number, since it uses less digits than its factorization.

1257616220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8982989 (or 8982987 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 1257616220 is about 35462.8851054169. The cubic root of 1257616220 is about 1079.4007363616.

The spelling of 1257616220 in words is "one billion, two hundred fifty-seven million, six hundred sixteen thousand, two hundred twenty".