190640640 has 160 divisors (see below), whose sum is σ = 617924736. Its totient is φ = 50135040.

The previous prime is 190640633. The next prime is 190640657. The reversal of 190640640 is 46046091.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 190640598 and 190640607.

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, 790920 + ... + 791160.

Almost surely, 2^190640640 is an apocalyptic number.

190640640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 190640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (308962368).

190640640 is an abundant number, since it is smaller than the sum of its proper divisors (427284096).

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

190640640 is a wasteful number, since it uses less digits than its factorization.

190640640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 190640640 is about 13807.2676514943. The cubic root of 190640640 is about 575.5351187291.

The spelling of 190640640 in words is "one hundred ninety million, six hundred forty thousand, six hundred forty".