64402005620 has 48 divisors (see below), whose sum is σ = 136781111376. Its totient is φ = 25468800000.

The previous prime is 64402005601. The next prime is 64402005637. The reversal of 64402005620 is 2650020446.

It can be written as a sum of positive squares in 8 ways, for example, as 581099236 + 63820906384 = 24106^2 + 252628^2 .

It is a congruent number.

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, 1393280 + ... + 1438760.

It is an arithmetic number, because the mean of its divisors is an integer number (2849606487).

Almost surely, 2^64402005620 is an apocalyptic number.

It is an amenable number.

64402005620 is an abundant number, since it is smaller than the sum of its proper divisors (72379105756).

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

64402005620 is a wasteful number, since it uses less digits than its factorization.

64402005620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46292 (or 46290 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The spelling of 64402005620 in words is "sixty-four billion, four hundred two million, five thousand, six hundred twenty".