1975640730 has 64 divisors (see below), whose sum is σ = 5422878720. Its totient is φ = 451243584.

The previous prime is 1975640713. The next prime is 1975640749. The reversal of 1975640730 is 370465791.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 389551 + ... + 394589.

It is an arithmetic number, because the mean of its divisors is an integer number (84732480).

Almost surely, 2^1975640730 is an apocalyptic number.

1975640730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1975640730 is an abundant number, since it is smaller than the sum of its proper divisors (3447237990).

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

1975640730 is a wasteful number, since it uses less digits than its factorization.

1975640730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6923.

The product of its (nonzero) digits is 158760, while the sum is 42.

The square root of 1975640730 is about 44448.1802777122. The cubic root of 1975640730 is about 1254.7850152638.

The spelling of 1975640730 in words is "one billion, nine hundred seventy-five million, six hundred forty thousand, seven hundred thirty".