642560890 has 32 divisors (see below), whose sum is σ = 1214196480. Its totient is φ = 244362624.

The previous prime is 642560881. The next prime is 642560899. The reversal of 642560890 is 98065246.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (642560881) and next prime (642560899).

It is not an unprimeable number, because it can be changed into a prime (642560899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30046 + ... + 46774.

It is an arithmetic number, because the mean of its divisors is an integer number (37943640).

Almost surely, 2^642560890 is an apocalyptic number.

642560890 is a deficient number, since it is larger than the sum of its proper divisors (571635590).

642560890 is a wasteful number, since it uses less digits than its factorization.

642560890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16926.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 642560890 is about 25348.7847834960. The cubic root of 642560890 is about 862.9217776067.

The spelling of 642560890 in words is "six hundred forty-two million, five hundred sixty thousand, eight hundred ninety".