861528491274 has 64 divisors (see below), whose sum is σ = 1947548344320. Its totient is φ = 251708280000.

The previous prime is 861528491269. The next prime is 861528491279. The reversal of 861528491274 is 472194825168.

It is an interprime number because it is at equal distance from previous prime (861528491269) and next prime (861528491279).

It is not an unprimeable number, because it can be changed into a prime (861528491279) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 232302 + ... + 1333049.

It is an arithmetic number, because the mean of its divisors is an integer number (30430442880).

Almost surely, 2^861528491274 is an apocalyptic number.

861528491274 is an abundant number, since it is smaller than the sum of its proper divisors (1086019853046).

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

861528491274 is a wasteful number, since it uses less digits than its factorization.

861528491274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1565667.

The product of its digits is 7741440, while the sum is 57.

The spelling of 861528491274 in words is "eight hundred sixty-one billion, five hundred twenty-eight million, four hundred ninety-one thousand, two hundred seventy-four".